The aim of a study is to test the ratio of variances in the weight of two groups of rats being under a certain drugs A( group 1) and B( group 2). A random sample of 16 rats was selected from group 1and 13 rats from group 2 Then their weight were recorded. The results are shown in the following table Construct a 95% confidence interval for the ratio of the varliances.

Q: In a study of speed dating, male subjects were asked to rate the attractiveness of their female…

A: Given The data is as follows: 5, 7, 2, 8, 5, 5, 6, 9, 7, 9, 4, 9 CL=0.99

Q: It has been found that the average time Internet users spend online per week is 18.3 hours with a…

A: 1. It is assumed that, µ is the true average time Internet users spend online per week.

Q: The data from an independent-measures research study produce a sample mean difference of 4 points…

A:

Q: An independent-measures study has M1 = 45 and M2 = 49 with a pooled variance of s2p = 4. For this…

A: Given: M1=45M2=49sp2=4Cohen's d=-2.00

Q: State the null and alternate hypotheses (write it mathematically) andwrite your claim.   Find the…

A: x1 =473x2 = 459 s1 = 39.7s2 =24.5 n1 = 8n2 =18

Q: To study the variability of in a test with grades from 0 to 5, 17 students were drawn from a school…

A: Maximum=5, minimum=0. Which estimator has variance  minimum, then they have best estimator.

Q: A random sample selected from a normal population with mean variance o2 gave the values 25, 31, 23,…

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Q: The promoter of a touring dance show wishes to analyse how the price per ticket affects the size of…

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Q: Two suppliers manufacture a plastic gear used in a laser printer. The impact strength of these gears…

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Q: How would Interpret the following  data using two sample t-testing if unequal variances? Each of…

A: From the given Excel output, the t test statistic is 5.6086 and the p-value for the two tail is…

Q: Exercise 13.23 Algo (Randomized Block Design) Source of Variation An experiment has been conducted…

A: Given information: Number of treatments(t)=4Number of blocks…

Q: 9. Two samples of ten each from the male and female workers of a large company have been taken. The…

A: The independent two sample t-test is used when there are two groups only.

Q: A transect is an archaeological study area that is mile wide and 1 mile long. A site in a transect…

A:

Q: Directions: Determine whether the numerical value is a parameter or a statistic. Explain your…

A: Parameter: A parameter is a value that describes some measure of population. Statistic: A measure…

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A:

Q: Suppose we want to estimate the difference between the room rates of luxury hotels in New York…

A: Given,

Q: Professor Hayashi wants to see if a new Canvas Homework system has an effect on how well students…

A: Sample mean = x̅ = 81.7 Sample size = n = 9 Sample S.D = s =√32.49 = 5.7 Standard Error = s/√n…

Q: determine if there is a significant difference between the average height of two different species…

A: We have given that,  n1 = n2 = 25  s1 = 2 and s2 = 3 x̄1 = 15 and x̄2 = 16 Then,  We will find t-…

Q: Researchers conducted a study to determine whether magnets are effective in treating back pain. The…

A: We have given that  Treatment with sample size of 42 and mean of 0.69 and standard deviation of 0.25…

Q: population sta ke use of the C periment might

A: Sample sizes are: nA=26nB=26 Sample means are: x¯A=20.1x¯B=24.1 So, x¯A-x¯B=4 Population standard…

Q: • Example: Suppose that the variance o² of the normally distributed diameter lengths of steel balls…

A: Given that Sample size =12 Sample variance=0.022 We have to find 90% confidence interval for the…

Q: The Tennessee Health Department is concerned about average baby length. We know that the national…

A: We have given that n=613836

Q: The standard error of the mean difference between male and female drivers (i.e., the se) is .50.…

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Q: if variances are unequal, which would be an alternate non-parametric test for the independent…

A: When the variances are unequal, Mann-Whitney U Test would be an alternate non-parametric test for…

Q: A company is doing a hypothesis test on the variation in quality from two suppliers. Both…

A:

Q: 95% confidence interval for the average increase of height.

A: Given that  In year 1970 In year 2020 Mean (μ1)=30  Mean (μ2) = 31.5  Variance (σ12) = 4.5…

Q: c) Check whether the assumptions of normality and variance equality are satisfied for part b of this…

A: From part (b) p-value = 0.0000, which is less than alpha that is the level of significance. We…

Q: The aim of a study is to test the ratio of variances in the weight of two groups of rats being under…

A:

Q: Suppose the variance of house selling prices in both Calgary and Edmonton are known. We are…

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Q: A company is doing a hypothesis test on the variation in quality from two suppliers. Both…

A: The question is about hypo. testing Given : Randomly selected no. of products from supplier 1 ( n1 )…

Q: It is known that the overall job satisfaction (score range 0-10) of professors follows a normal…

A: Write the sample data from the histogram. One column for x values and second column for…

Q: Suppose you are interested in studying regional differences in crime rates. You take a random…

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Q: A manufacturer of metal plates makes two claims concerning the thickness of the plates they produce.…

A: From the given data in part (b), we calculate sample mean and sample variance Mean,…

Q: An analysis of variances produces dftotal = 35 and dfwithin = 32. For this analysis, what is…

A: A one-way analysis of variances produces dftotal = 35 and dfwithin= 32. For this analysis, what is…

Q: The manufacturer of a new eye cream claims that the cream reduces the appearance of fine lines and…

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Q: A producer of chocolate candy bars has developed an improved recipe for one of their most popular…

A: Since we only answer up to 3 sub-parts, we’ll answer the first 3. Please resubmit the question and…

Q: company manufactures a certain over-the-counter drug. The company samples 80 pills and finds that…

A: We have given that  Sample size n = 80 Sample mean = 325.5 Standard deviation s=10.3 90%confidence…

Q: You read in the report of a psychology experiment: "Separate analyses for our two groups of 12…

A:

Q: researchers are concerned about the impact of students working while they are enrolled in classes,…

A: It is given that sample mean is 7.1 hours and the standard deviation is 5 hours.

Q: A company wants to estimate, at a 95% confidence level, the annual difference between male…

A: The confidence interval is the interval in which the population parameter is likely to fall. For…

Q: An article about “Relative Controllability of Dissimilar Cars” reported a study in which 14 subjects…

A: sample mean, x = 1.21 sample variance = 160.7824 sample standard deviation, s = 160.7824 = 12.68…

Q: Question 1 : Compute the value of the test statistic. Round your answer to three decimal places.…

A: Let the two populations be women after the treatment and women before the treatment.Let be the…

Q: Say we were testing the effects of taking calcium on bone density levels and obtained a positive and…

A: R-squared (R2) is a statistical measure of the goodness-of-fit for linear regression models which…

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.