Mental measurements of young children are often made by giving them blocks and telling them to build a tower as tall as possible. One experiment of block building was repeated a month later, with the times (in seconds) and five pairs of children’ completion times are listed below. Test the claim that there is a difference in times between two trials. (a) At α = 5%, use the Classical approach to conclude it. (b) Using the P-value approach to conclude it.   1st Trial (A) 33  28  29  26  29 2nd Trial (B)30  25  24  24  29

Q: A researcher wishes to try three different techniques to lower the blood pressure of individuals…

A: 1. Number of treatments: In the given situation, there are 3 treatments. That is, K=3.00

Q: You are testing the null hypothesis that there is no relationship between two​ variables, X and Y.…

A: Obtain the value of the test statistic. The value of the test statistic is obtained below as…

Q: the Because npo (1- Po) = L 10, the sample size is 5% of the population size, and the sample…

A: Let p0 be the proportion of females aged 15 and older lived alone. Given that p0=59%=0.59 Sample…

Q: 58% of students entering four-year colleges receive a degree within six years. Is this percent…

A: Given,n=267x=139population proportion(P)=0.58and α=0.10

Q: In recent years, approximately 55% of eligible voters take the time to vote in presidential…

A: The objective of this question is to determine whether there is convincing evidence at the 0.01…

Q: A sample of n=32 individuals is selected from a population with u=34 and o=8 and a treatment is…

A:

Q: A researcher wants to investigate different weigh loss options in rats. He divides 24 rats (equal…

A: Given: A researcher wants to investigate different weigh loss options in rats. He divides 24 rats…

Q: A previous study showed that the average number of sticks of gum that someone who often uses gum was…

A: Consider that μ is the population mean number of sticks of gum a person chewed daily.

Q: In a previous year, 62% of females aged 15 and older lived alone. A sociologist tests whether this…

A: From the provided information,Sample of females is The number of living alone is Level of…

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

A: Solution: State the hypotheses. Null hypothesis: H0: p≤0.50 Alternative hypothesis: H1: p>0.50…

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

A: Given: Test statistic z= 1.42 P- value: The P-value is obtained Excel function “=NORMSDIST(z)”.

Q: A population has a mean of µ = 20. A sample is selected from this population and a treatment is…

A: Given, μ=20s2=64 X=28 n=16 α=0.05

Q: A researcher is interested in hamster wheel-running activity during the summer versus the winter. He…

A: The average difference score is MD = 3.8, the sum of squares is SS = 522.15 and the sample size is n…

Q: giving them wood and asking them to build the tallest tower humanly possible. 1 of those…

A: Solution

Q: A medical researcher wishes to try three different techniques to lower cholesterol levels of…

A: Hypothesis: The null and alternative hypotheses are below: H0: There is no difference among the…

Q: Go through the steps of ANOVA hypothesis testing to see if you can conclude that there difference…

A: Excel Procedure: Enter the data for Autistic, Normal and Mentally in Excel sheet>Go to Data…

Q: Find the t-value for a=0.005 one-tailed test with n=25.

A: Computation of degrees of freedom:It is given that α=0.005; n=25.Also, it is given that the test is…

Q: Does training in stress reduction make a difference for student success? 15 students received…

A:

Q: re lower in English college placement tests than the national average? A researcher obtained the…

A: As the population standard deviation is known, we will use z distribution. To determine, that the…

Q: A repeated measures study comparing two treatments with a sample of n=4 participants produces Md=4…

A:

Q: A researcher conducts an experiment comparing two methods of teaching young children to read.  An…

A: Given information: The given values are: T(120) = 2.10, p-value = 0.04 and d = 0.34.

Q: n a test of H0: p = 0.4 against H1: p ≠ 0.4, a sample of size 100 produces Z = 1.28 for the value of…

A: The p-value (or observed level of significance) of the test is approximately equal to…

Q: A new insecticide is advertised to kill more than 95% roaches upon contact.  In a laboratory test,…

A: The random variable roach upon contact follows binomial distribution. X ~ B (n, p). We have to use…

Q: In a previous year, 57% of females aged 15 and older lived alone. A sociologist tests whether this…

A: Given data in the problem issample of females n= 650  living alone x=365Level of significance = 0.01…

Q: A scale measuring confidence in the media was administered to a sample of seventy-one respondents.…

A:

Q: What is the P-Value and Test Statistic of this problem.  The dean of a university estimates that…

A: Solution: The dean of a university estimates that the mean number of classroom hours per week for​…

Q: A sample of 25 is selected from a population with μ=40 and a treatment is administered to the…

A: The sample size is 25 and the population mean is μ=40 The sample mean and variance are M=43 and s2=9…

Q: Confidence in banks: A news poll conducted in  2012  asked a random sample of  1268  adults in the…

A: From the provided information,

Q: you are conducting a study to see if the average female life expectancy is significantly different…

A: Answer By using standard normal distribution, [z]

Q: ample of n = 36 scores is selected from a population with σ = 12. If the sample mean of M = 56…

A: The formula of z score is, z=M-uσ/n

Q: Consider a test of H0:p=0.4 versus Ha:p>0.4�0:�=0.4 versus ��:�>0.4, the sample data yielded…

A: The objective of this question is to determine whether we should reject or fail to reject the null…

Q: In 2008, the population of part-time college students was 60% female. We are curious if the…

A:

Q: An experiment was conducted to test the effect of a new stain remover. Twenty stains were treated…

A: Step 1: Determine the appropriate decision for this hypothesis testDecision Rule: Reject the null…

Q: A researcher wishes to try three different techniques to lower the blood pressure of individuals…

A: 1. Null Hypothesis: H0: There is no difference among the means of three groups. Alternative…

Q: It was claimed that 75% of doctors recommend tablet A to all diabetes patients. Recently, a…

A: Significance level = 0.05.  problem can be solved by calculation p-value.

Q: Hypertension It has been found that 26% of men 20 years and older suffer from hypertension (high…

A:

Q: A sample of n=25 scores is obtained from a population with u=70 and o=25. If the sample mean is…

A: Z-score: The z-score value is a numerical measurement that describes a value of the relationship to…

Q: Previously, 4​% of mothers smoked more than 21 cigarettes during their pregnancy. An obstetrician…

A: We have given that  Hypothesised proportion p = 4% = 0.04 Sample size n = 115 Favourable cases X = 3…

Q: Do these teachers differ significantly in their opinion on this issue?

A: Given that, No. of teachers interviewed = 60 Level of significance (α)= 0.05 The observed values…

Q: investigate, the analyst selects a random sample of 500 households and finds that 98% of them…

A: We have to find the null and alternate hypothesis.

Q: A sample of n = 16 scores is obtained from a population with μ = 70 and σ = 20. If the sample mean…

A: The sample mean also follow normal distribution with following parameters

Types of Bias

Statistics is the study of data collection, organization, analysis, interpretation, and presentation. Statistical bias is a characteristic of a statistical technique or its findings in which the expected value deviates from the actual root quantitative parameter being estimated. According to the actual definition of bias, it refers to the tendency of a statistic to overestimate or underestimate a parameter.