A researcher hypothesizes that the average number of sports that a college offers for males is greater than the average number of sports offered for females. A random sample of 50 colleges found a mean of 8.6 sports for men and 7.9 sports for women. The population standard deviation is known to be 3.3 for both groups. At α=0.10, is there enough evidence to support the claim?

Q: A sample of 16 scores has a standard error of 12. What is the standard deviation of the population…

A: The standard error of the mean is,

Q: Past experience indicates that the time required for high school seniors to complete a standardized…

A:

Q: A scrap metal dealer claims that the mean of its cash sales is ‘no more than $80’, although an…

A:

Q: A random sample of n = 16 scores is selected from a normal population with a mean of μ = 50. After a…

A: a) The claim of the test is the sample mean sufficient to conclude that the treatment has a…

Q: A juice factory buys apple concentrate from two different suppliers. The mean concentration is the…

A: F-test of equality variances is a test for the null hypothesis  that two normal populations have the…

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

A: Solution: State the hypotheses. Null hypothesis: That is, the bag filling machine works correctly…

Q: On their website, a property management company states that the mean monthly rent for apartments an…

A: Given : Claim : The mean monthly rent for apartments on the east side is less than what is stated on…

Q: A random sample of 17 police officers in Brownsville has a mean annual income of $35,800 and a…

A: Denote μ1, μ2 as the true population mean incomes of police officers for Place B and G,…

Q: Suppose x has a normal distribution with a population standard deviation of 2.2. If a random sample…

A:

Q: The sales representative for a manufacturer of a new product claims that the product will increase…

A: Solution

Q: The Omani-student in a large university took a survey and It was found that the mean health care…

A:

Q: A sample of n = 25 scores is determined to have a standard error of 2 points. what is the standard…

A: Given data, SE=2 n=25 s=?

Q: A sports statiscian claims that the mean winning times for Boston Marathon women's division open…

A: The claim is that “the mean winning times for Boston Marathon women's open division champions is at…

Q: A researcher knows from past studies that the standard deviation of the time it takes to inspect a…

A:

Q: A manufacturer is interested in the output voltage of a power supply used in a PC. Output voltage is…

A:

Q: A sample of difference scores from a repeated-measures experiment has a mean of MD=3 with a standard…

A: The difference in score is measured so the null hypothesis will claim that the there is no…

Q: The CEO of a large financial institution claims that, on average, their clients invest more than R45…

A: Statistical hypothesis testing is an important method in inferential statistics. It is used to test…

Q: A random sample of n = 4 scores is obtained from a population with a mean of µ = 80 and a standard…

A: Solution: From the given information, n=4, µ=80, σ=10 and M=90.

Q: The CEO of a large financial institution claims that, on average, their clients invest more than…

A: Given sample details : Sample Mean (Xˉ)(\bar X) = R74 000 Sample Standard Deviation (s)(s) = R7 000…

Q: A simple random sample of 26 filtered 100-mm cigarettes is obtained from a normally distributed…

A: Null and alternative hypotheses: Null hypothesis: H0: σ= 0.25 Alternative hypothesis: H1: σ≠ 0.25…

Q: A psychologist reports that the average length of R.E.M. sleep in his test subjects was 10 minutes.…

A: Hypothesis Testing: Hypothesis is a procedure by which we can tests an assumption regarding a…

Q: For a population mean of 50, a sample mean of 52, an estimated standard deviation of 3, and a sample…

A: Given information Population mean µ = 50 Sample size (n) = 20 Mean x̅ = 52 Standard deviation (s) =…

Q: A manufacturer claims that the mean lifetime, μ, of its light bulbs is 44 months. The standard…

A:

Q: A sample of 4 scores has a variance of s2 = 64. What is the estimated standard error for the sample…

A: Standard Error:  Standard error gives the accuracy of a sample mean by measuring the…

Q: The mean tar content of a simple random sample of 25 unfiltered​ king-size cigarettes is 20.8 ​mg,…

A: Given: n1=25x¯1=20.8s1=3n2=25x¯2=13.0s2=3.9

Q: A snack food manufacturer estimates that the variance of the number of grams of carbohydrates in…

A: Introduction: Denote the true population variance of the amount of carbohydrates (grams) in servings…

Q: To disprove a previous study that claims that college graduates make an average salary of $46,000, a…

A:

Q: A study claims tha.t on average, male high school students spend at least 3.39 hours a day playing…

A: The summary of the statistics is, x¯=4.12,σ=2.05,n=30μ=3.39 The formula for calculating the z-score…

Q: The average income in Boston is 6200 witha standard deviation of 8000, while the average income in…

A: GivenFor BostonMean(μ)=6200standard deviation(σ)=8000For chicagoMean(μ)=48000standard…

Q: A sample of n=25 scores has a mean of 68. Find the z-score for this sample:   If it was obtained…

A:

Q: Select all that apply:   Reject the null hypothesis.   Fail to reject the null…

A: Explanation:The decision rule regarding the testing of hypothesis for a left-tailed alternative…

Q: A simple random sample of 2929 filtered 100-mm cigarettes is obtained from a normally distributed…

A: The known values are a) The null and alternative hypothesis is, Hence, the correct answer is…

Q: A study at the University of Colorado at Boulder shows that running increases the percent resting…

A: The average RMR of 30 elderly women runners was 34.0% higher than the average RMR of 30 sedentary…

Q: It is desirable to compare the yields of two different types of wheat seeds. An average of 575 kg of…

A:

Q: An industrial company claims that the mean pH level of the water in a nearby river is6.8. You…

A: Statistical hypothesis testing is an important method in inferential statistics. It is used to test…

Q: The scores of a random sample of 100 high school students on a standardized mathematics test in a…

A: Given Data : Sample Size , n= 100 Sample Mean , x̄ = 78.0 population standard…

Q: The strength of steel wire made by an existing process is normally distributed with a mean of 1550…

A: The strength of steel wire made by an existing process is normally distributed with mean 1550 psi…

Q: In the comparison of two kinds of paint, a consumer testing service finds that four 1-gallon cans of…

A: We want to test the hypothesis

Q: According the U.S. Department of Education, full-time graduate students receive an average salary of…

A:

Q: The CEO of a large financial institution claims that, on average, their clients invest more than…

A: Null hypothesis:   H0: µ≤150,000   Alternative hypothesis:   Ha:µ>150,000.

Q: A recent study found that 62 children who watched a commercial for potato chips featuring a…

A: Given, -x1 = 39, n1 = 62, s1 = 21.4 -x2 = 25, n2 = 52, s2 = 12.9

Q: In a left-tailed hypothesis for a population mean where the population standard deviation is…

A: Each hypothesis test has two approaches to maked conclusion about them. The two approaches are p…

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

A: Solution: The given claim is that mean cash sales is no more than R80. From the given information n=…

Q: ey found that the average hotel room rate in State I is RM88.22 and the average room in State II is…

A: Following hypothesis can be created as:   The critical value from standard normal distribution at…

Q: A manufacturer claims that the light bulbs that they produce have a mean lifetime of 1,200 hours and…

A: It is given that, A manufacturer claims that the light bulbs that they produce have a mean lifetime…

Q: A technical training firm claims that the average time for their trainees to master a particular…

A: Given: The number of students tested every month is n=24. The sample mean time for their trainees to…

Q: A simple random sample of 2828 filtered​ 100-mm cigarettes is obtained from a normally distributed​…

A: Given information Sample size, n = 28 Sample standard deviation, s = 0.22 Significance level, α =…

Q: A math teacher claims that the mean scores on a math assessment test for fourth grade boys and girls…

A: The provided information is  x¯2=151x¯2=149s1=36s2=34n1=13n2=15α=0.01 a.The null and alternative…

Q: The CEO of a large financial institution claims that, on average, their clients invest more than R95…

A: Null Hypothesis: H0: The average invest is not more than 95,000 Alternative Hypothesis: H1: The…

Q: An orange juice producer buys all his oranges from a large orange grove. The amount of juice…

A: An orange juice producer buys all his oranges from a large orange grove. The amount ofjuice squeezed…