In testing for the equality of two population variances, when the populations are  normally distributed, the 10% level of significance has been used. Determine the  upper-tail area of rejection region

Q: A sample of 9 days over the past six months showed that a dentist treated the following numbers of…

A: Given: n=9 The number of patients are as follows: 22, 25, 20, 18, 15, 22, 24, 19 and 26. The sample…

Q: Regarding the SPSS output of an Independent Samples t test, if Levene’s Test for Equality of…

A: It is given that, if Levene’s test for equality of variance is significant. That is, the variances…

Q: To decide whether the variation among sample mean ranks is large enough to warrant rejection of the…

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Q: In a study of high-achieving high school graduates, the authors of a report surveyed 832 high school…

A: Excel: Data --> megastat -->Chi-square Contingency Table Test for Independence

Q: scrap metal dealer claims that the mean of his cash is 'no more than R80', but an Internal Revenue…

A: We  have given that  mu= 80 , variance =441, n= 20  Mean= xbar = 91  level of significance =alpha…

Q: Use a 0.05 significance level to test the claim that the two samples are from populations with the…

A: n1 =35n2 = 40 x1 = 19.4x2 = 15.1s1 = 1.4s2 = 0.8

Q: A quality-control manager was concerned about variability in the amount of an active ingredient in…

A: Given data: Sample size = 21 To find: What is the probability that the sample variance of the amount…

Q: The pooled variance value will be closer to whichever sample variance is larger, regardless of…

A: The pooled variance value will be closer to whichever sample variance is large, regardless of sample…

Q: Two samples, each with n =5 scores, have a pooled variance of 40. What is the estimated standard…

A: Given: Let the pooled variance be sp2 n1=n2=5   Let the standard error be SE Formula for Standard…

Q: A candy company claims that 11% of the jelly beans in its spring mix are pink. Suppose that the…

A: Given that  n=25 , p=11%=0.11 , q=1-p=1-0.11=0.89

Q: For a one-way analysis of variance comparing four treatments, MSbetween = 12. What is the value of…

A: It is given that the number of treatment levels is 4 and MSbetween = 12.

Q: The analysis of variance (ANOVA) can be used for comparing the equality of more than two treatment…

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Q: Is the Chebyshev's rule used only with populations? Are samples used as well?

A: Yes, Chebyshev’s rule can be applied to population as well as sample.We should know the following…

Q: When performing a two-sample t-test, if the variance in the two groups being compared are considered…

A: 2 sample test is used to compare the means of 2 samples. t-test is a parametric test.

Q: An adventure company runs two obstacle courses, Fundash and Coolsprint, with similar designs. Since…

A: From the provided information,

Q: 4. Describe the homogeneity of variance assumption and explain why it is inportant for the…

A: Homogeneity of variance states that the variance in each group should be equal (or homogeneous).…

Q: When is the population standard greater than the population variance?

A: Variance: The variation between each observation from its mean is known as variance. The greater the…

Q: Give 2 examples of Variance and standard deviation for grouped data to coefficient of skewness and…

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Q: Use a 0.05 significance level to test the claim that the different samples come from populations…

A: Hello! As you have posted more than 3 sub parts, we are answering the first 3 sub-parts.  In case…

Q: To conduct a hypothesis test comparing two population variances, both pop must be normally…

A: Assumptions for two sample variance test: Two populations should be normally distributed. Two…

Q: To compare customer satisfaction levels of two competing ice cream companies, 8 customers of Company…

A: Given, n1=8n2=5x1=3.21x2=2.22s1=0.31s2=0.21α=0.05 For equal variance: The degrees of freedom is…

Q: A survey was conducted to compare the mean cost of a meal at fast food restaurants in two different…

A: From the given information, Lets significance (α) = 0.05. Hypothesis test: Test statistics:

Q: The purchase value of transactions at a grocery store is normally distributed with a mean of $244…

A: Consider X be a random variable which follows normal distribution indicates the purchase value of…

Q: a. Construct an interval estimate at 95°/ confidence interval for difference of means of two ice…

A: Answer:-  We have given that, n1=8 n2=5 X1=3.21 x2=2.22 S1=0.31 S2=0.21

Q: Identify the appropriate test procedure based on the graphs of the two populations. Note that all…

A: Solution-: We find which test based on given graph

Q: The Wilcoxon signed-rank test can be used to perform a hypothesis test for a population median, η,…

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Q: what is the general alternative hypothesis for a two tailed independent samples t test

A: Null and alternative hypotheses: The hypothesis, which is pre assumed as true, tentatively settled…

Q: The number of words in the active vocabulary of children of a particular age is normally distributed…

A: Obtain the minimum number of words the child would have to know to be in the top 2%. The minimum…

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

A:

Q: what test is used to determine whether two population means are different when the variance are…

A: Solution :  when the variance are known and sample size is large then we use z test to determine…

Q: educator Is Interested in determining if the medium used for online classes, whether a smartphone or…

A: Given data S (x1) 0 3 0 2 3 0 1 5 4 3 L/D (x2) 2 7 3 3 0 3 1 3 1 5

Q: A High performance Tailoring company "Shawapna" at Mirpur sampled its delivery records (in days) for…

A: First we have to calculate the mean and SD for Shawapna company and then coefficient of variation to…

Q: Under what conditions should you use the pooled-variance t test to examine possible differences in…

A: Two samples are said to be independent if the sample values selected from one population are not…

Q: If the sample has n = 18 scores, determine whether the sample is sufficient to conclude that the…

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Q: Perform the analysis of variance (ANOVA) at the 5% significance level to identify is there any…

A: Excel Procedure: Enter the data for 1, 2, 3 in Excel sheet>Go to Data Menu>Click on Data…

Q: For an analysis of variance comparing four treatments, MSpetween = 12. What is the value of…

A: Given: MS between=12 Total number of treatments = k = 4 The between degrees of freedom can be…

Q: The test score data from the sample of trainees are as follows: 1. Was the knowledge (test score)…

A: Given information: μ=65n=24α=0.05

Q: A survey was conducted to compare the mean cost of a meal at fast food restaurants in two different…

A:

Q: A paint manufacturer wants to introduce a new paint on the market. The following data were obtained…

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Q: In case of hypothesis testing in places where population variances are unknown and sample size is…

A: Here we have given the multiple choice question about the hypothesis testing. The question is,    In…

Q: If other factors are held constant, increasing the sample variances will have very little influence…

A: Effect size : The size of the effect indicates how significant the association between variables or…

Q: Two samples, each with n = 5 scores, have a pooled variance of 40. What is the estimated standard…

A: Given Datan1 = n2 = 5pooled variance = 40Estimated standard error is given by

Q: Explain the circumstances under which we would need to pool the variance for an independent samples…

A: The pooled sample variance offers a higher precision estimate of the variance than the individual…

Q: if the original distribution is positively skewed, what is the distribution of z scores?

A: Given : Positively skewed distribution . It is also known as right-skewed distribution Here ,…

Q: What is the relationship between the sampling variance of an OLS parameter estimate, and the total…

A: Sampling variance is the variance of the sampling distribution for a random variable. It measures…

Q: The F-statistic is a ratio score resulting in a measure of the estimated proportion of variance due…

A: The F-statistic is a ratio score resulting in a measure of the estimated proportion of variance due…

Q: the homogeneity of variances assumption states that the variance in the two samples must be equal?…

A: Homogeneity of variances always make about the population variance not about sample.

Q: We want to test if there is a difference in the amount the families in the two cities spend on…

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Q: An independent-measures design study with n = 16 in each sample produces a sample mean difference of…

A: Given that, Sample sizes n1=n2=16 Sample mean difference x1¯-x2¯=4 Pooled variance sp2=24