An engineer has designed a valve that will regulate water pressure on an automobile engine. The valve was tested on 170 engines and the mean pressure was 7.5 pounds/square inch (psi). Assume the population variance is 0.36. The engineer designed the valve such that it would produce a mean pressure of 7.4 psi. It is believed that the valve does not perform to the specifications. A level of significance of 0.02 will be used. Find the value of the test statistic. Round your answer to two decimal places.

Q: A computer program designer has developed an online questionnaire that she believes will take a mean…

A: Zcritical=Zα/2=1.6449 H0:μ=12 vs H1:μ≠ 12  n=38, x¯=11.4  and σ=2.2 Z=(X¯-μ)σ/n

Q: An engineer has designed a valve that will regulate water pressure on an automobile engine. The…

A:

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 filling variance for boxes of cereal is designed to be .02 or less. A sample of 41 boxes of…

A: 1] s=standard deviation=0.16 2] n=41 3] α=0.05

Q: data is highly skewed,

A: In case the data is highly skewed, can we still rely on the kurtosis coefficient? Why or why not?…

Q: A recruitment specialist wishes to examine whether there is any difference between the variation in…

A: Accounts are taken as group 1. Marketers are taken as group 2. Given:…

Q: If the variance of the Electrical Engineering board examination result is 36, what is the minimum…

A:

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: 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 producer claims that the lengths of manufactured parts have a variance less than or equal to 0.05…

A: Solution: Given information: n= 15 Sample size  s2= 0.08 inches2     Sample variance σ2= 0.05…

Q: A company of coffee prices at 4 randomly seleced grocery stores in Sampaloc, Manila showed increases…

A: Given data is12,15,17,20sample size(n)=4sample mean(x¯)=12+15+17+204sample mean(x¯)=644sample…

Q: As a part of her evaluation of New Orleans city employees, the Mayor instructs you to audit the…

A: In past years, the number of improperly issued tickets per officer had a Normal distribution with a…

Q: As a part of her evaluation of Atlanta city employees, the Mayor instructs you to audit the parking…

A:

Q: An engineer has designed a valve that will regulate water pressure on an automobile engine. The…

A: In a Hypothesis test null hypothesis state that there is no statistical significance between two…

Q: As a part of her evaluation of New Orleans city employees, the Mayor instructs you to audit the…

A: Considering the mean number of issued tickets is to be tested with the specified standard deviation…

Q: Find the response variable and explanatory variable in this study? b. Using the sample information,…

A:

Q: A manufacturer of chocolate chips would like to know whether its bag filling machine works correctly…

A: From the given information n = 21, µ = 416, M = 407 Sample variance s2 = 900 Null and alternative…

Q: A market research group would like to know the satisfaction of subscribers in terms of the quality…

A:

Q: State the null and alternative hypotheses for the above scenario.

A: Here the variance is supposed to be known.The main objective is to test whether the valve performs…

Q: please explain how to use the standard deviation from the 1-Var Stats statistical output to obtain…

A: Hint:  Standard devation =Variance

Q: A study was conducted using 60 mobile network users, who volunteered to participate in the research…

A: Given that,  For Mobile network A, mean is x̄A= 8.2  Standard deviation is, sA= 5.9 For Mobile…

Q: If a data set has 25 values and a standard deviation of 7.4, then the variance is?

A: Given: Standard deviation = 7.4

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

A: See the handwritten solution

Q: Should be consider this score unusual? What is the value of the test statistic?

A:

Q: Assuming that the population variances are​ equal, construct a 95​% confidence interval estimate of…

A: Com (1) Alternative (2) n1 = 62 n2 = 52 X¯1 = 39 X¯2 = 25 S1 = 21.4 S2 = 12.9 95% CI = X¯1…

Q: The township of Middleton sets the speed limit on its roads by conducting a traffic study and…

A:

Q: A marine biologist claims that the mean length of mature female pink seaperch is different in fall…

A: Given data is appropriate for testing of hypothesis to test t-test for difference of means because…

Q: Steve believes that his wife's cell phone battery does not last as long as his cell phone battery.…

A:

Q: As a part of her evaluation of New Orleans city employees, the Mayor instructs you to audit the…

A:

Q: An engineer has designed a valve that will regulate water pressure on an automobile engine. The…

A: It is given that  Sample mean, M = 4.6 Population mean, μ = 4.4 Population standard deviation, σ =…

Q: A set of data is mounded, with a mean of 450 and a variance of 625. Approximately what proportion of…

A: Normal Distribution :  Normal distribution, also known as the Gaussian distribution, is a…

Q: Find the variance of the probabilty distribution for the histogram

A:

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

A:

Q: Explain how the variance in the numerator and denominator of each F-ratio of a 2-way ANOVA is…

A: Variance in the Numerator and Denominator for 2-Way ANOVA

Q: A SAMPLE SIZE OF 36 WAS DRAWN AND ITS MEAN WAS FOUND TO BE 80. TEST WHETHER THIS SAMPLE COULD HAVE…

A:

Q: A year-long fitness centre study sought to determine if there is a relationship between the amount…

A:

Q: the ____ focuses only on the middle 50 percent of the cases in a distribution.  -interquartile…

A:

Q: Steve believes that his wife's cell phone battery does not last as long as his cell phone battery.…

A:

Q: To test if there is a difference in the population variances, the appropriate degrees of freedom (in…

A: Note : Since you have asked multiple questions, we will solve the first question for you. If you…

Q: If the variance of the civil Engineering board examination result is 81, what is the minimum number…

A:

Q: In drilling a vertical wellbore, the spacing between major fractures are recorded It has been found…

A: Standard normal distribution: The standard normal distribution is a special case of normal…

Q: As a part of her evaluation of New Orleans city employees, the Mayor instructs you to audit the…

A: For the given data What are the critical values for this hypothesis test?

Q: An analysis of variances produces dftotal = 16 and dfwithin = 14. For this analysis, how many…

A:

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: 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: 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: If the variance of the water temperature in a lake is 28 degrees. How many days (sample size n)…

A: The formula for finding the sample size is,