Refer to Exercise 8.S.1. Compare the before and after populations using a t test at α = 0.05. Use a nondirectional alternative. 8.S.1 A volunteer working at an animal shelter conducted a study of theeffect of catnip on cats at the shelter. She recorded the number of“negative interactions" each of 15 cats made in 15-minute periods beforeand after being given a teaspoon of catnip. The paired measurementswere collected on the same day within 30 minutes of one another; the dataare given in the accompanying table.29a. Construct a 95% confidence interval for the difference in meannumber of negative interactions.b. Construct a 95% confidence interval the wrong way, using theindependent-samples method. How does this interval differ from theone obtained in part (a)?CatBefore (Y.)After (Y)DifferenceAmeliaBathsheba36-3Boris34-1Frank1-1JupiterLupine45-1Madonna1.3-2Michelangelo21Oregano35-2Phantom7-2Posh1.Sawyer1-1Scary35-2Slater2-2Tucker22Mean1.82.8-1SD1.662.371.20

a ) Sample Before After difference (d) (d-d̄)2 1 0 0 0 1 2 3 6 -3 4 3 3 4 -1 0 4 0 1…

Answered: ct of catnip on cats at the shelter.…

ct of catnip on cats at the shelter. She recor jative interactions" each of 15 cats made in after being given a teaspoon of catnip. The A collected on the same day within 30 minut

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

See similar textbooks

Related questions

Q: 3. The weights of babies who were given two types of diets were recorded as follows: Diet A Diet B…

A: Given that x1=5.80x2=5.73 s1 =1.04 s2 =1.13 n1 =14 n2=14 l.o.s.=α=0.05

Q: 7. A/n is the difference between an obser model being studied and contains information abe B. Range…

A: Answer : A Residual is a difference between an observation (yi,j) and its estimated value from the…

Q: Is the following statement true? "Values between the LB and UB values of a 95% CI are all equally…

A: Answer is given below-

Q: 3. Two machines are used for filling plastic bottles with a net volume of 16.0 ounces. The fill…

Q: A sample has a mean of 5.3, a median of 5.1, a sample standard deviation of 1.2, and a sample…

Q: You wish to test the following claim (Ha) at a significance level of a = 0.02. H₂:1 = 42 H₂:1<42 You…

A: Null Hypothesis Alternative Hypothesis (claim)Significance level

Q: You are conducting a study to see if the accuracy rate for fingerprint identification is…

A: It is given that the test statistic is 1.182.

Q: The following data represent the results from an independent-measures study comparing two treatment…

A: As per guidelines we will solve first question only, please repost other questions for more answers.…

Q: A major car manufacturer wants to test a new catalytic converter to determine whether it meets new…

A: The following information is provided. Sample size n=10 Sample mean x=17.17 Sample standard…

Q: Part 2: o rats take less time on average than hamsters to travel through a maze? The table below…

A: It is given that: There are two independent samples, Rats and Hamsters. Since, the population…

Q: Red Orange 39 43 Yellow Green Blue 43 39 38 39 33 35 31 34 41 44 42 34 32 42 35 39 37 32 45 40 39 36…

A: Hi! Thank you for the question, As per the honor code, we are allowed to answer three sub-parts at a…

Q: You are testing the null hypothesis that there is no linear relationship between two variables, X…

A: The independent variable is X. The dependent variable is Y. This is simple linear regression model.…

Q: A data set about speed dating includes "like" ratings of male dates made by the female dates. The…

A: Given that x̄ = 6.57 , μ = 7 , s = 1.85 , n = 188

Q: You wish to test the claim that the first population mean is greater than the second population mean…

A: Note: Hey, since there are multiple subparts are posted, we will answer first three subparts for…

Q: Given the following sample statistics X(bar) = 20, Y(bar) = 200, Sx = 100, Sy = 60, Rxy = 0.4, n =…

A: Given: x=20, y=200, sx=100, sy=60, rxy=0.4 and n=50. Then,b1=rxysysx=0.460100=0.24

Q: The following hypotheses are given. H0: ρ ≤ 0 H1: ρ > 0 A random sample of 12 paired observations…

A: Here the given information is The following hypotheses are given. H0: ρ ≤ 0 H1: ρ > 0 A random…

Q: mates that the average daily per-store theft is less than $100, but wants to determine the accuracy…

A: Mall security estimates that the average daily per-store theft is less than $100, but wants to…

Q: In testing for differences between the means of two related populations, what is the null…

Q: The standard score for a two-tailed test is 2.0. What is the P-value? (Don't Hand writing in…

A: Given:The standard score for a two-tailed test is 2.0.

Q: Use an independent-measures t test with α = .05 to determine whether there is a significant mean…

A: 2. The hypothesis is, Null hypothesis: H0:μ1-μ2=0 Alternative hypothesis: H1:μ1-μ2≠0 The pooled…

Q: A normal population has a mean 100 and variance 25. How large must the sample size be if we want the…

Q: Workers at a certain soda drink factory collected data on the volumes (in ounces) of a simple random…

A: Assume that σ is the population standard deviation of volume of soda cans.

Q: A researcher decides prior to her study that she will set the α value at .05. She measures two…

A: α=0.05, r=-0.31, p=0.24

Q: Treatment 8. Use the following statistical output to write the correct results statement for an…

A: Given that Analysis of variance table We have to write correct result statement for experiment…

Q: QUESTION 5 Populations are different than samples because, (Select all that apply). parameters…

A: Ans: Populations are different than samples because.....

Q: We want to test the null hypothesis that population mean = 10. Using the following observations,…

A: We have given the following data . 9,10,4,5 , 6,7,8 Sample size = 7 From the given data we…

Q: Determine , and , fom the given parameters of the population and sample s 43. e18, n-38

A: Given problem Given that Mean = 43 Standard deviation = 18 n = 38

Q: A hamburger chain states that its hamburgers weigh on average ¼ of a pound prior to cooking. We…

A: From the given information, Claim: Test if the mean weight for all the hamburgers at this chain is…

Q: Suppose (X₁, X₂, ..., X9) is a random sample from Normal(µ = 2,0² = 4²). Let X be the sample mean of…

A: As per our guidelines we are supposed to answer only 3 subparts of any questions so i am solving…

Q: A researcher examined the effect of music on memory. For the general population, the distribution of…

Q: Which of the following illustrates a limitation of the chi-square test? a. It is not…

A: Which of the following illustrates a limitation of the chi-square test? Answer: Correct option is C…

Q: Claim: μ₁ = ₂; x = 0.05. Assume o 0 ² = 0²/2 1 Sample statistics: x₁ = 33.3, s₁ = 3.5, n₁ = 13 and…

A: Givenclaim is μ1=μ2α=0.05Assume σ12=σ22Mean(x1)=33.3standard deviation(s1)=3.5sample…

Q: Assume that adults have IQ scores that are normally distributed with a mean of 100.3 and a standard…

A: Assume that adults have IQ scores that are normally distributed with a mean of 100.3 and a standard…

Q: use pic to answer, test is anova one way test 1. Did researchers use the correct test? a. yes b.…

A: The study is about the happiness levels, a sample of 65 college students were recruited and assigned…

Q: We have a recent set of data of n=30 Americans, the sample mean = 14 hours per day, the standard…

A: The sample mean and population mean is whether related or not is calculated using the z test when…

Q: You are conducting a study to see if the proportion of voters who prefer Candidate A is…

Q: Hypertension A pilot study of a new antihypertensive agent is performed for the purpose of planning…

A: From the given information, let…

Q: This exercise requires the use of a statistical software package. The cotton aphid poses a threat to…

A: It is given that the variable y be the infestation rate, x1 be the mean temperature, and x2 be the…

Q: Cigarette Smoking A researcher found that a cigarette smoker smokes on average 31 cigarettes a day.…

A: μ=31,n=8,X¯=28,s=2.9,α=0.01

Q: The number of incidents in which police were needed for a sample of 11 schools in one county is: 18…

A: Use EXCEL Procedure to obtain the value of first quartile. Follow the instruction to obtain the…

Q: 1. Find the quartiles (Q1, Q2, Q3, Q4) of the given data set. 2. Determine in what quartile does…

Q: To determine if their 2.50 inch galvanized pipes are properly adjusted, Hoffman Manufacturing has…

A: The data is given on the diameter of the galvanized pipe for subgroups.data:Sample meanSample…

Q: Use the data below taken from a random sample of adults, and the a = 0.01 level of significance, to…

A: Given that: Arm length(cm) Charitable Giving ($) 199 368.6 202 348.74 209 358.41 200…

Q: s there a significant relationship between subject’s IQ and pre-test scores?α =.05, two tailed, if…

A: We perform a hypothesis test of the “significance of the correlation coefficient” to decide whether…

Q: Use a 0.01 significance level to test the claim that the two samples of Yttrium concentrations (in…

A: Given : The level of significance is 0.01 and the steps to test the claim the two samples of…

Q: Person 1 Person 2 Person 3 Person 4 Person 5 Person 6 Person 7 Person 8 Person 9…

A: Note: Hi there! Thank you for posting the question. As there are multiple sub parts, according to…

Q: random sample of 76 eighth-grade students' scores on a national mathematics assessment test has a…

A: According to the given information in this question We need to find the test statistic p value and…

Q: Aspirin III: Decision and Conclusion Regarding the experiment in the data frame Aspirin from the abd…

A: The given results are:

Question

Refer to Exercise 8.S.1. Compare the before and after populations using a t test at α = 0.05. Use a nondirectional alternative.

8.S.1 A volunteer working at an animal shelter conducted a study of the
effect of catnip on cats at the shelter. She recorded the number of
“negative interactions" each of 15 cats made in 15-minute periods before
and after being given a teaspoon of catnip. The paired measurements
were collected on the same day within 30 minutes of one another; the data
are given in the accompanying table.29
a. Construct a 95% confidence interval for the difference in mean
number of negative interactions.
b. Construct a 95% confidence interval the wrong way, using the
independent-samples method. How does this interval differ from the
one obtained in part (a)?
Cat
Before (Y.)
After (Y)
Difference
Amelia
Bathsheba
3
6
-3
Boris
3
4
-1
Frank
1
-1
Jupiter
Lupine
4
5
-1
Madonna
1.
3
-2
Michelangelo
2
1
Oregano
3
5
-2
Phantom
7
-2
Posh
1.
Sawyer
1
-1
Scary
3
5
-2
Slater
2
-2
Tucker
2
2
Mean
1.8
2.8
-1
SD
1.66
2.37
1.20

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

SEE SOLUTION Check out a sample Q&A here

Step 1-

Step 2

Step 3

Step 4

Step by step

Solved in 4 steps with 2 images

SEE SOLUTION Check out a sample Q&A here

Similar questions

If we want to compare average charges for males and females, we would use O two sample z- test O single sample t-test O Correlation OTwo sample t-test
1. What is the standardized test statistic? t = ___. 2. What is/are the critical value(s)?
Need help with a review statistics question ASAP
To determine if their 1.50 centimeter bolts are properly adjusted, Norman & Mayer Manufacturing has decided to use an X-Chart which uses the range to estimate the variability in the sample. Table Control Chart Answer How to enter your answer (opens in r Step 1 of 7: What is the Center Line of the control chart? Round your answer to three decimal places. Period 1 2 3 4 5 6 Copy Table Tables Select the Copy Table button to copy all values. To select an entire row or column, either click on the row or column header or use the Shift and arrow keys. To find the average of the selected cells, select the Average Values button. ON obs1 obs2 1.45 1.52 1.55 1.51 1.51 1.50 1.50 1.53 1.46 1.53 1.52 1.54 1.51 1.50 1.50 1.52 1.46 1.47 1.52 1.53 1.53 1.54 1.53 1.53 1.53 1.53 1.54 1.48 1.54 1.49 1.53 1.50 7 1.46 1.46 1.54 1.48 1.49 1.51 8 1.47 1.48 1.51 1.51 1.53 1.50 9 1.50 1.54 1.54 1.53 1.53 1.49 10 1.54 1.49 1.55 1.51 1.51 1.50 Keypad Copy Table Average Values The average of the selected cell(s)…
I need help with stats, section 7.2 and 7.3, please help with TI-84 calculator commands Test the claim about the population mean, μ, at the given level of significance using the given sample statistics. Claim: μ=40; α=0.01; σ=3.17. Sample statistics: x=38.1, n=72 Identify the null and alternative hypotheses. Write out the correct null and alternative hypotheses. Calculate the standardized test statistic: The standardized test statistic is ________________ (round to 2 decimal places as needed) Determin the critical value(s). Select the correct choice below and fill in the answer box to complete your choice. (round to 2 decimal places as needed) a. the critical value is ______________ b. the critical values are + _ ___________ Determine the outcome and conclusion of the test. Choose the correct answer below. A. fail to reject Ho. AT the 1% significane level, there is not enough evidence to reject the claim. B. fail to reject Ho. At the 1% significance…
If the test requires that the results be statistically significant at a level of α = 0.05, fill in the blanks and complete the sentences that explain the test decision and conclusion. The decision is to reject the null hypothesis. There is enough evidence at a significance level of a = 0.05 that the mean weight for U.S. women of age 40-49 who smoke daily is less than 169.976 pounds.
You wish to test the claim that the first population mean is not equal to the second population mean at a significance level of α=0.02 . Ho:μ1=μ2 Ha:μ1≠μ2 You obtain the following two samples of data. Sample #1 Sample #2 67.1 64.2 32.7 49.0 63.8 54.8 63.5 54.1 65.6 54.8 40.5 58.7 39.4 43.1 72.5 73.1 70.2 71.2 68.1 73.1 79.7 67.3 66.5 61.7 62.9 76.5 What is the test statistic for this sample?test statistic = Round to 3 decimal places. What is the p-value for this sample?p-value = Use Technology Round to 4 decimal places. The p-value is... less than (or equal to) α greater than α This test statistic leads to a decision to... reject the null accept the null fail to reject the null As such, the final conclusion is that... There is sufficient evidence to warrant rejection of the claim that the first population mean is not equal to the second population mean. There is not sufficient…
The weekly expenditure on groceries of a random sample of 100 family households was recorded. It was estimated that the mean expenditure was approximately $240. With rising interest rates and petrol prices, it was anticipated that grocery expenditure might decrease. Which hypothesis test would you use to test this claim? 1.One tailed, one sample t-test 2.Two tailed, one sample t-test 3.One tailed, z-test 4.One-tailed Paired Samples t-test 5.Chi Square
You are conducting a study to see if the accuracy rate for fingerprint identification is significantly different from 0.51. Thus you are performing a two-tailed test. Your sample data produce the test statistic - 2.153. Find the p-value accurate to Z = - 4 decimal places. p-value
An engineer has designed a valve that will regulate water pressure on an automobile engine. The valve was tested on 160 engines and the mean pressure was 7.7 pounds/square inch (psi). Assume the population variance is 0.36. If the valve was designed to produce a mean pressure of 7.8 psi, is there sufficient evidence at the 0.01 level that the valve performs below the specifications? Step 3 of 3: Make the decision to reject or fail to reject the null hypothesis.
Based on the scatterplot, describe the association between the two variables. Comment on form, direction, and strength.
A one-sample z-test compares a sample with 50 participants with mean 83 to a population with mean 80 and standard deviation 10. What is the effect size d? 0.1 0.3 0.5 0.7