In 2002, the mean age of an inmate on death-row was 40.7 years, according to data from the US Department of Justice. Suppose a sociologist wondered whether the mean age of a death-row inmate has decreased since then. She randomly selects 52 death-row inmates and finds that their mean age is 37.9 years, with a standard deviation of 7.6. Has the mean age decrease significantly since 2002? Perform a hypothesis test.

Q: The U.S. Center for Disease Control reports that in year 1900, the mean life expectancy is 47.6…

A: Given  nw=117, x¯w=46.7 and  sw=11.4 And           nnw=86, x¯nw=38.4 and  snw=15.4

Q: The U.S. Center for Disease Control reports that in year 1900, the mean life expectancy is 47.6…

A: The random variable life span follows normal distribution. There are two independent samples which…

Q: c. Find the p-value. Round to 4 decimals. p-value = d. Make a decision. O Fail to reject the null…

A: Given : Mean : x1 = 46.9x2 = 36.2 standard deviation : σ1 = 12.4σ2 = 15.3 Sample size : n1 = 124n2 =…

Q: The U.S. Center for Disease Control reports that the mean life expectancy was 47.6 years for whites…

A: From the provided information,

Q: An article in the Register stated that students in the state university system take 4.5 years, on…

A: Givensample size(n)=49Mean(x)=5.1standard deviation(s)=1.2significance level(α)=0.01

Q: Do the data support your claim at the 1% level?

A: The summary of the statistics is, The type of test is right tailed test

Q: The U.S. Center for Disease Control reports that the mean life expectancy was 47.6 years for whites…

A: a.) The Hypotheses The hypotheses are: H0​:μW​=μNW​H1​:μW​=μNW​ b.) The Test Statistic The…

Q: Suppose the prevalence of type II diabetes in a community is 36%. Researchers want to sample 16…

A:

Q: The U.S. Center for Disease Control reports that in year 1900, the mean life expectancy is 47.6…

A: Given Information: White: Sample size n1=124 Sample mean x¯1=46.9 Sample standard deviation s1=12.4…

Q: The U.S. Center for Disease Control reports that in year 1900, the mean life expectancy is 47.6…

A: 1.) Preliminary Condition Check: a.) One condition that must be satisfied for the independent t-test…

Q: Suppose, according to a 1990 demographic report, the average U. S. household spends $90 per day.…

A:

Q: Suppose a population has a mean happiness score of 75 and a standard deviation of 15. Researcher A…

A:

Q: e heights of adult men in the United States are normally distributed with a mean of 70 inches and a…

A: Given: μ=70, σ=2.5 The corresponding z-value needed to be computed: The probability that men in US…

Q: In Professor Krugman’s economics course, the correlation between the students’ total scores prior to…

A: a)   The equation of the line is y=143.2608+1.344x and it is obtained below:   From the given…

Q: A bank loan officer rates applicants for credit. The ratings can be described by a normal model with…

A: Given: μ = ​200 σ = 50

Q: Can the standard deviation of a data set be zero

A: Standard deviation can not be negative.

Q: An article in the San Jose Mercury Newsstated that students in the California state university…

A:

Q: The U.S. Center for Disease Control reports that the mean life expectancy was 47.6 years for whites…

A: The z-test Two- Sample for means tool runs a two sample z-test means with known variances to test…

Q: A recent study found that 69% of all adults over 50 wear sunglasses for driving. In a random sample…

A: Formula : Mean = np Standard Deviation  :

Q: Professor Ivy’s students have a Mean grade of 69.5 and a Standard Deviation of 6.5.  If Johnny has…

A: From the provided information, Mean (µ) = 69.5 Standard deviation (σ) = 6.5 Let X be a random…

Q: 1900 in a certain county. Of the 124 whites, the mean life span was 45.3 years with a standard…

A: Given Data : For Sample 1 x̄1 = 45.3 s1 = 12.7 n1 = 124 For Sample 2…

Q: In a study of 400 people, the mean age is 50 years and the standard deviation of age is 10 years.…

A:

Q: A study by the National Center for Health Statistics suggested that women between the ages 20 and 29…

A: 0.33271Explanation:For the given normal distribution with μ=26.8 and σ=7.4, the required proportion…

Q: Suppose that you randomly survey death records for people born in 1900 in Louisiana and compared the…

A:

Q: The U.S. Center for Disease Control reports that in year 1900, the mean life expectancy is 47.6…

A: White:Sample size Sample mean Sample standard deviation Non-whites:Sample size Sample mean Sample…

Q: a survey found that 21% of Americans watch fireworks on television on July 4.  Find the mean,…

A: According to the given question, a survey found that 21% of Americans watch fireworks on television…

Q: If a student scored 77 points on a test where the mean score was 84.5 and the standard deviation was…

A: Given: Score of student(x)=77Population meanμ=84.5Population standard deviationσ=5.1

Q: Suppose the average credit card debt for Americans is $7000 and is not normally distributed with a…

A: Given information:  Population mean (u) = $ 7000  Sample size (n) = 40 Sample mean (x) = $ 6500…

Q: The U.S. Center for Disease Control reports that in year 1900, the mean life expectancy is 47.6…

A: Given, μw=47.6μnw=33Whitesnw=117X¯w=46.7Sw=11.4Non-Whitesnnw=86X¯nw=38.4Snw=15.4

Q: An article in the San Jose Mercury News stated that students in the California state university…

A: State the hypotheses.

Q: Two students were informed that they received standard z-scores of 0.9 and -0.5, respectively on a…

A: Solution : Given : z1 = 0.9            z2 = -05            x1 = 95            x2 = 60 Here, X :…

Q: One year Hank had the lowest ERA (earned-run average, mean number of runs yielded per nine innings…

A: Given,For the males,Mean ERA (μ) = 4.635 and standard deviation (σ) = 0.576.Hank had the lowest ERA…