A sample is selected from a population with u = 50. After a treatment is administered to the individuals in the sample, the mean is found to be M = 55 and the variance is s? = 64. a. If the sample has n=4 scores, then conduct a hypothesis test to evaluate the significance of the treatment effect and calculate Cohen's d to measure the size of the treatment effect. Use a two-tailed test with a = .05. b. If the sample has n = 16 scores, then conduct a hypothesis test to evaluate the significance of the treatment effect and calculate Cohen's d to measure the size of the treatment effect. Use a two-tailed test with a = .05. c. Describe how increasing the size of the sample affects the likelihood of rejecting the null hypothesis and the measure of effect size.

A sample is selected from a population with u = 50. After a treatment is administered to the individuals in the sample, the mean is found to be M = 55 and the variance is s? = 64. a. If the sample has n=4 scores, then conduct a hypothesis test to evaluate the significance of the treatment effect and calculate Cohen's d to measure the size of the treatment effect. Use a two-tailed test with a = .05. b. If the sample has n = 16 scores, then conduct a hypothesis test to evaluate the significance of the treatment effect and calculate Cohen's d to measure the size of the treatment effect. Use a two-tailed test with a = .05. c. Describe how increasing the size of the sample affects the likelihood of rejecting the null hypothesis and the measure of effect size.

Name: A sample is selected from a population with u = 50. After a treatment
Uploaded: 2024-03-20T07:07:12.000Z
Channel: Bartleby
Description: A sample is selected from a population with u = 50. After a treatment is administered to theindividuals in the sample, the mean is found to be M = 55 and the variance is s? = 64.a. If the sample has n=4 scores, then conduct a hypothesis test to eval

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

See similar textbooks

Related questions

Q: A researcher is interested in the relationship between one’s satisfaction with pay (X) and one’s…

Q: A data set includes weights of garbage discarded in one week from 62 different households. The…

Q: ur environment is very sensitive to the amount of ozone in the upper atmosphere. The level of ozone…

A: “Since you have posted a question with multiple sub parts, we will provide the solution only to the…

Q: Two samples each have n = 4 scores. The first sample has a variance of s2 = 10 and the second sample…

A: The estimated standard error for the sample mean difference is given by, standard error=s12n1+s22n2…

Q: Assume thAt scores on a standardized test are known to follow a bell shaped distribution with a mean…

A: L

Q: Sample 1 (n = 6) from population 1 has a mean of 42.00 and a variance of 29.00. Sample 2 (n = 8)…

A: The given summary statistics are as follows:

Q: Suppose that the random variable X measures the number of hot dogs purchased in a food court in an…

A: CorX,Y=0.75VX=VY=36W=2X+3Y

Q: A hospital analyzed, for several randomly selected employees, the relationship between the…

A: Given: n=16SSxx=26.92SSyy=104.00SSxy=-50.40

Q: Compute the values a and b such that the fit of type aX+b provide the desired mean and variance?

Q: ta set includes weights of garbage discarded in one week from 62 different seholds. The paired…

Q: The Braking Distance of 8 Volkswagen GTIs and 10 Ford Focuses were tested when traveling at 60 miles…

A: Given that 1. State the alternative hypothesis. a. Ha : μ1 < μ2 b. Ha : μ1 >…

Q: Use the table of critical values of the Pearson correlation coefficient to determine whether the…

Q: Given that the variances of random variables X and Y are 400 and 900, respectively. The correlation…

A: Basic

Q: The accounting department analyzes the variance of the weekly unit costs reported by two production…

Q: A sample of n =25 means has a variance of 36. What is the standard error for the sample means?…

A: Sample size, n = 25 Variance = 36 We know that, Standard deviation = VarianceStandard deviation…

Q: In a test of hypothesis, the null hypothesis is that the population mean is equal to 32 and the…

A: Given that,population mean() = 32sample size (n) = 40Sample mean () = 32.75Standard deviations (s) =…

Q: A sample of n= 4 scores has a variance of s 64. What is the estimated standard error for the sample…

A: Givensample size(n)=4variance(s2)=64

Q: Listed below are the number of cricket chirps in 1 min and the corresponding temperatures in degrees…

A: (A). Null and alternative hypotheses: The investigator is interested to test whether there is any…

Q: The recidivism rate for convicted sex offenders is 9%. A warden suspects that this percent is higher…

A: Given Z=test statistic=2.697, Hypothesis Ho: p=0.9 vs H1: p>0.9 (right tailed) Level of…

Q: We are interested in comparing the average study hours for economic majors at USC and UCLA. We drew…

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

Q: 3.12. A pharmaceutical manufacturer wants to investigate the bioactivity of a new drug. A completely…

Q: A data set includes weights of garbage discarded in one week from 62 different households. The…

A: Correlation coefficient (r) is a measure of association or relationship between two variables. The r…

Q: A normal population has a mean of ? = 7. After receiving a treatment, a sample of n = 4 scores…

A: Given that, The hypothesized mean μ=7 Sample size n=4 The data is as follows, xi 4 8 4 4…

Q: Two separate samples, each with n = receive different treatments. After treatment, the first sample…

A: Standard error- Standard error shows how accurate your mean is by comparing it to the mean of all…

Q: A researcher for a cereal company wanted to demonstrate the health benefits of eating oatmeal. A…

A: Given information: The data represents the cholesterol scores at the end of the 30-day period and…

Q: 11.2 A sample is selected from a population mean of u = 30. A treatment is administered to the…

A: Given : Population mean = μ = 30 Sample mean = x = 31.3 Sample Variance = s2 = 12 Sample Standard…

Q: Our environment is very sensitive to the amount of ozone in the upper atmosphere. The level of ozone…

Topic Video

Question

A sample is selected from a population with u = 50. After a treatment is administered to the
individuals in the sample, the mean is found to be M = 55 and the variance is s? = 64.
a. If the sample has n=4 scores, then conduct a hypothesis test to evaluate the
significance of the treatment effect and calculate Cohen's d to measure the size of the
treatment effect. Use a two-tailed test with a = .05.
b. If the sample has n = 16 scores, then conduct a hypothesis test to evaluate the
significance of the treatment effect and calculate Cohen's d to measure the size of the
treatment effect. Use a two-tailed test with a = .05.
c. Describe how increasing the size of the sample affects the likelihood of rejecting the
null hypothesis and the measure of effect size.

Expert Solution

This question has been solved!

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

This is a popular solution!

SEE SOLUTION Check out a sample Q&A here

Step 1

Step 2

Step 3

Step 4

Step 5

Trending now

This is a popular solution!

Step by step

Solved in 5 steps

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

$Hypothesis Tests and Confidence Intervals for Means$

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, statistics and related others by exploring similar questions and additional content below.

Similar questions

A physical therapist wanted to know whether the mean step pulse of men was less than the mean step pulse of women. She randomly selected 54 men and 70 women to participate in the study. Each subject was required to step up and down a 6-inch platform. The pulse of each subject was then recorded. The following results were obtained. Two sample T for Men vs Women N Mean StDev SE Mean Men Women 98% CI for mu Men - mu Women (- 12.20, - 1.00) T-Test mu Men = mu Women (vs H2 O C. Ho: H1 = H2; Ha: H1 #H2 (b) Identify the P-value and state the researcher's conclusion if the level of significance was a = 0.01. What is the P-value? P-value =
The recidivism rate for convicted sex offenders is 9%. A warden suspects that this percent is higher if the sex offender is also a drug addict. Of the 396 convicted sex offenders who were also drug addicts, 51 of them became repeat offenders. What can be concluded at the a = 0.05 level of significance? a. For this study, we should use z-test for a population proportion b. The null and alternative hypotheses would be: Но: 0.09 |(please enter a decimal) H1: P 0.09 (Please enter a decimal) c. The test statistic ? 2.697 (please show your answer to 3 decimal places.) d. The p-value =| 0.0035 v (Please show your answer to 4 decimal places.) e. The p-value is f. Based on this, we should reject the null hypothesis. g. Thus, the final conclusion is that ... O The data suggest the populaton proportion is significantly higher than 9% at a = 0.05, so there is statistically significant evidence to conclude that the population proportion of convicted sex offender drug addicts who become repeat…
Our environment is very sensitive to the amount of ozone in the upper atmosphere. The level of ozone normally found is 6.7 parts/million (ppm). A researcher believes that the current ozone level is at an insufficient level. The mean of 810 samples is 6.6 ppm. Assume the variance is known to be 1.00. Does the data support the claim at the 0.02 level? Step 1 of 5: Enter the hypotheses: Answer 2 Points E Keypad Keyboard Shortcuts Họ: Prev Ne: © 2020 Hawkes Learning MacBook Air 80 888 DII DD F1 F2 F3 F4 F5 F6 F7 F8 F9 F10 F11 ! @ %23 & 1 2 3 4 %3D Q W E T Y { P A S D F G H J K C M ? on command command option .. .- V - * 00 B.
An analysis of variance produces SSbetween = 30, SSwithin = 60, and an F-ratio with dfbetween = 2 and dfwithin 15. For this analysis, what is the F-ratio? a. 30/60 = 0.50 b. 60/30 = 2.00 c. 15/4 = 3.75 d. 4/15 = 0.27
The following information is available for two samples selected from independent normally distributed populations. Population A: n1=30 S2/1=25 Population B: n2=30 S2/2=36 a. Which sample variance do you place in the numerator of FSTAT? b. What is the value of FSTAT?
Our environment is very sensitive to the amount of ozone in the upper atmosphere. The level of ozone normally found is 4.4 parts/million (ppm). A researcher believes that the current ozone level is not at the normal level. The mean of 1090 samples is 4.3 ppm. Assume the variance is known to be 1.44. Does the data support the claim at the 0.05 level? Step 1 of 5: Enter the hypotheses: Step 2 of 5: Enter the value of the z test statistic. Round your answer to two decimal places. Step 3 of 5: Specify if the test is one-tailed or two-tailed. Step 4 of 5: Enter the decision rule. Step 5 of 5: Enter the conclusion.
The average score on a statistics test was 2.52 with a standard deviation of 0.75. The teacher suspects that the exam was very difficult; Based on the above, he wants to adjust the scores so that the mean is 3.58 and the standard deviation is 0.25. Compute the values a and b such that the fit of type aX+b provide the desired mean and variance? Calculate: a=?b=?
A researcher would like to evaluate the effectiveness of a pain-relief patch designed for lower back pain. Prior to testing the patch, each of n = 8 patients rates the current level of back pain on a scale from 1 to 10. After wearing the patch for 90 minutes, a second pain rating is recorded. The data are as follows: Include in your responses: A. Compute the mean and variance for the sample of difference scores. B. Provide the Null and alternative hypotheses C. Calculate SSD
A sample of 100 scores has a mean of 58, a variance of 160, and an estimated standard error of 4. Which of these values is guaranteed to increase if the sample size is decreased to 10? a. none of these is likely to be changed very much by decreasing n. b. the value of the variance c. the value of the mean d. the value of the standard error
Choose the appropriate statistical test. When computing, be sure to round each answer as indicated. A dentist wonders if depression affects ratings of tooth pain. In the general population, using a scale of 1-10 with higher values indicating more pain, the average pain rating for patients with toothaches is 6.8. A sample of 30 patients that show high levels of depression have an average pain rating of 7.1 (variance 0.8). What should the dentist determine? 1. Calculate the estimated standard error. (round to 3 decimals). [st.error] 2. What is thet-obtained? (round to 3 decimals). 3. What is the t-cv? (exact value) 4. What is your conclusion? Only type "Reject" or Retain"
Justin wants to know whether a commonly prescribed drug does improve the attention span of students with attention deficit disorder (ADD). He knows that the mean attention span for students with ADD who are not taking the drug is 2.3 minutes long. His sample of 12 students taking the drug yielded a mean of 4.6 minutes. Justin can find no information regarding σx , so he calculated s2x =1.96. a. Identify the independent and dependent variables. b. In a sentence, state the null hypothesis being tested. c. Using symbols, state the null and alternative hypotheses. d. Determine the critical region using a one-tailed test with alpha = .05. e .Conduct the hypothesis test (Do the math and compare the t-critical and t-obtained values). f. State your conclusions in terms of H0 (Should you reject the H0 or fail to reject/accept the H0). g. Based on your analysis, is there a relationship between the drug and attention span?
A researcher selects a sample from a population with µ = 30 and uses the sample to evaluate the effect of a treatment. After treatment, the sample has a mean of M = 32 and a variance of s 2 = 6. If Cohen’s d is used to measure the size of the treatment effect, which of the following would have no effect on the value of Cohen’s d? a. an increase sample variance b. an increased sample mean c. an increased sample size d. Each of these of these aspects will influence the value of Cohen’s d.