The 2 – inch - long bolts manufactured by a company must have a variance of 0.003 square inches before a buyer makes a purchase. A random sample of 29 such bolts gave a variance of 0.0058 square inches. Test at 1% level of significance if the variance of all such bolts is greater than 0.003 square inches.

Q: A corporation desires to estimate the total number of man-hours lost, for a given month, because of…

A: Note: HI there! Thank you for posting the question. As there are several independent question, we…

Q: A random sample of 16 Porsche drivers yielded an average age of 50 years with a variance of 9 years…

A: Solution: Given information: Porsche Driver n1= 16x1= 50s12 = 9 Ferrari Driver n2= 16x2 = 47s22= 25…

Q: When determining the relationship between final grades in KINE 2049 and in KINE 2050 from 105…

A: The question is based on testing of correlation coeff. Given : No. of students ( n ) = 105 Shared…

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

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Q: When engaging in weight-control (fitness/fat burning) types of exercise, a person is expected to…

A: Given information, n=41x¯=107s=9000=94.8683μ=120

Q: At a local store, Sixty-five female employees were randomly selected and it was found that their…

A: Given that, n1=65, x1=640, s1=122n2=75, x2=682, s2=169 The null and alternative hypothesis is,…

Q: The manufacturer of a certain brand of lightbulbs claims that the variance of the lives of these…

A: The hypotheses for the test are given below: Null hypothesis: H0: σ2 = 4200. Alternative hypothesis:…

Q: A researcher is interested in whether people are able to identify emotions correctly when they are…

A: Let 'X' represent the accuracy ratings of people in the general population. According to the given…

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: A random sample of 22 lawn mowers was selected, and the motors were tested to see how many miles per…

A: Solution: From the given information, S2=2.6 and n=22. The level of confidence is 0.95.

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

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Q: An analysis of variances produces dftotal = 29 and dfwithin = 27. For this analysis, what is…

A: Given information- We have to find-

Q: Two new drugs are being compared for effectiveness in lowering total cholesterol levels. On the…

A: We have given that  On the sample of 15 subjects, drug A is found to lower total cholesterol by an…

Q: A population of Senior High School consits of number 1,2,3,4 and 5 .Compute the mean ,variance and…

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Q: In a study conducted on the variance of weights of bread produced daily in a bread factory, the…

A: the average weight of 51 breads was calculated as 400gr and variance as 700.  the variance of bread…

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 study found that 1% of Social Security recipients are too young to vote. If 800 Social Security…

A: Here, n=800 and p=0.01. The mean is 8, which is obtained below: μ=np=800×0.01=8

Q: A supplier sells ropes. He claims that the ropes have a mean strength of 34 pounds and a variance of…

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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: For an analysis of variance comparing three treatment means with a separate sample of n = 10…

A: Solution: From the given information, there are three treatments and n=10. Then, the number of…

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: In a study comparing the systolic blood pressure of individuals sitting and standing, 14 subjects…

A: Given that :    We have to find rejection region and critical region:

Q: A random sample of 23 bags of apples (marked as 10 pounds each) received by a large grocery chain…

A: Solution: State the hypotheses. Null hypothesis: That is, the true mean of all bags is not less…

Q: A carpenter is making doors that are 2058 millimeters tall. If the doors are too long they must be…

A: It is given that the sample mean and variance are 2,069 and 900. The hypothesized population mean is…

Q: In a drug trial, Merck was interested in deciding whether, in the range 40 to 80 mg, the dosage of a…

A: The mean of sample means is X¯¯=X¯1+X¯2+...+X¯nn   =∑iX¯inwhere X¯i=ith sample mean…

Q: If homogeneity of variance is violated for a correlated-groups t-test, what nonparametric test…

A: Introduction: A correlated-groups t-test, also known as the paired t-test, is used to compare…

Q: For a randomly chosen adult staying in Condominium Merak, X represents the time, in minutes, spent…

A: X: Time (in mins) spent per week exercising in the gym. Y: Time (in mins) spent per week jogging. X…

Q: A statistician chooses 27 randomly selected dates, and when examining the occupancy records of a…

A: Givensample size(n)=27Variance(s2)=34.34conidence level=95%

Q: students. Use a significance level of 5%.  What is the alternative hypothesis?   Group of answer…

A: The given data is A researcher wants to examine different online teaching environments by collecting…

Q: In a sample of 57 business trips taken by employees in the HR department, a company finds that the…

A:

Q: In 2014, the variance of the ages of all workers at a large company that has more than 30,000…

A: Consider that σ2 is the population variance of the ages of all workers at a large company.

Q: A company that manufactures cars wants to estimate the variance of kilometers per liter for its…

A:

Q: A sample of 12 patients suffering from a flu participated in an experiment in which a new medication…

A: Given that Sample size n = 12 Sample variance = 1.5

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

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Q: Is there a significant difference between the average HDL  levels of normal and obese adults?

A: It is given that For Normal, sample size n1 = 14, sample mean = 45, sample SD s1 = 10.1 For Obese,…

Q: For a standardized psychology examination, the scores have a mean of 500 and a variance of 9475. It…

A: From the given information we conduct chi square test for variance.

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

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Q: A study was conducted to identify if there is a significant difference with two brands of shampoo.…

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Q: A researcher wants to examine different online teaching environments by collecting data on 20…

A: Determine if there is a significant difference between the average final exam score between the two…

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: A sample of 19 patients suffering from a flu participated in an experiment in which a new medication…

A: Given that Sample size n = 19 Sample variance = 1.5

Q: if there is a significant difference in systolic blood pressures between medication groups assuming…

A:

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

A:

Q: Suppose that a journal article reports that the mean age at marriage of Filipino women is 22.6 years…

A: Given Data : For Sample 1 x̄1 = 22.6 σ1 = √7.2 = 2.6833 n1 = 150 For…

Q: A new sleeping pill is advertised to increase the daily sleeping time of insomniacs by an average of…

A: The following information is provided. let X represents the increase in the sleeping time provided…

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

A: Given values, n=260x¯=4σ=0.64α=0.02

Q: A manufacturer of producing 50-ounce cookies was interested to inspect whether the the production…

A: Given: Sample size (n) = 25 Sample variance (s2) = 12.5