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It has been reported that males who are 55 or older spend an average of 43 minutes on-line, versus 38 minutes on-line daily for women in this age group. Assuming that file XR11030 contains the survey data underlying these results, use the 0.01 level of significance in examining whether the population means for daily online minutes might really be the same for the two genders in this age group. Identify and interpret the p-value for the test.
Construct and interpret the 99% confidence interval for the difference between the population means. Is the hypothesized difference (0.00) within the interval? Given the presence or absence of the 0.00 value within the interval, is this consistent with the findings of the hypothesis test?
Why is statistical significance not necessarily of practical important difference to a business decision? Give an example and explain.
chicken delight claims that 83 percent of its orders are delivered within 10 minutes of the time the order is placed. a
The Johnson family uses a propane tank for cooking on their gas grill. During the summer they need to replace their tank on average every 30 days.
The goal of a study by Klinger et al. was to determine how symptom recognition and perception influence clinical presentation as a function of race. They characterized symptoms and care-seeking behavior in African-American patients with chest pain..
Repeat this process 10 times or you can draw 10 samples simultaneously using StatTools. Make a histogram of the 10 values of sample means. You are constructing the sampling distribution of sample means. What is the center of your histogram?
For X set size k = 4, Y set size q = 3, c = 4 cycles for the X sample and d = 3 cycles for the Y sample, how many distinct possible permutations of the judgment ordered X and Y observations must be considered in order to compile the null distribut..
in order to escape the cool temperatures of kalamazoo you have decided to fly to sunny las vegas. unfortunately for you
a professional employee in a large corporation receives an average of m 42.4 e-mails per day. most of these e-mails
A sample mean, sample size, and population standard deviation are given. Use the P-value appraoch to perform a one-mean z-test about the mean, μ, of the population from which the sample was drawn. Determine the strength of the evidence against the..
For the five servers, determine the probability that none will receive a movie coupon.- two of the five will receive a coupon.
the recommended retail price of a new cancer drug is 150 per dose. the drug price in a random sample of 16 retailers is
Build a 95% confidence interval for the mean of the population from the given sample data.
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