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Times (in seconds) for the 100 freestyle and 100 backstroke were recorded for three top swimmers on a university swim team: 46.18 and 50.02; 46.62 and 50.22; 46.89 and 52.85.
a. Assuming these to be representative samples of all top swimmers' times for the two events, use software to produce a 95% confidence interval for the mean of the time differences, freestyle minus backstroke, for the two events.
b. Report whether or not the interval contains zero, or only positive numbers, or only negative numbers.
c. What does your answer to part (b) suggest?
Convert these four officers' scores to standardized z-values.Do you believe there was adequate reason to question these four exam scores? What suppositions are you making?
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For a binomial with n = 7 and p = .35, what is the probability of exactly 2 successes.- For a binomial with n = 18 and p = .6, determine the mean and variance of X, the total number of successes.
If a census division contains a large state, how will the monthly benchmark adjustment affect other states in the division?
question a convenience store owner hypothesizes that the median number of snow cones he sells per day is 36. a random
The mean life of your sample were more than 780 hours. What is the probability that you will not buy again from this manufacturer?
Develop the appropriate null and alternative hypotheses and what is the Type I error in this situation? What are the consequences of making this error?
License plates in the state of Maryland consist of three letters of the alphabet followed by three digits. How many will have distinct digits and distinct letters
Use q23data.dta.What is the relationship between the hours a person works and the hours his or her spouse works?Do this for women and for men separately.Compute the correlation, the regression results, and the scattergrams.
It was thought that hypnosis would lower a person's desire to smoke. A researcher decided to investigate this hypothesis using a paired-sample sign test in which the number of cigarettes/day smoked by subjects was recorded before and after hypnosi..
Is there evidence that men are more likely than women to make online purchases of books? Test an appropriate hypothesis and state your conclusion in context.
Explain why you are making the recommendation and you must include a recommendation that maximizes profits and a recommendation that minimizes loss.
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