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The heights of 18 year old men are approximately normally distributed with mean 68 inches and a SD of 3 inches.
A. What is the probability that an 18 year old selected at random is between 67 and 69 inches tall?
B. If a random sample of 9 18 year olds men is selected, what is the probability the the mean hight x is between 67 and 69 inches?
C. Compare answers for part A and B. Is the probability in part B much higher? Why would you expect this?
At the .10 significance level, can we conclude that there is a difference in the amounts quoted?
Interpret the correlation between each set of variables.
Of those customers using extra unleaded or premium gas, 60% fill their tanks. What is the probability that the next customer fills the tank?
At the .01 significance level, is there a difference in the mean number of times men and Women order take-out dinners in a month? What is the p -value?
Sixty percent of the families in a certain community own their own car, thirty percent own their own homes, and twenty percent own both their own home and own car. If a family in the community is randomly chosen, what is the probability that they ..
According to a recent study, 38% of all women will suffer a hip fracture because of osteoporosis by the age of 85. If six women aged 85 are randomly selected, what is the probability that a) None of them will suffer (or has suffered) a hip fractur..
Using the original data, estimate the population standard deviation with 90% probability.
A sample of 64 observations is selected from a normal polulation with a population standard deviation of 15. The sample mean is 215. Ho: U>= 220 and H1: U
Rhe frequency distribution summarizes a sample of times (in minutes) between eruptions of a cretain geyser. Find the approximate population mean and approximate population standard deviation of the data.
The upper limit of a 95% confidence interval for the population mean would equal:
The error between the sample mean and the population mean for a sample of n = 16 is 5 points and the error between a sample mean and population mean for a sample of n = 100 is 2 points. Explain the difference in the standard error for the two samp..
The payouts for the Powerball lottery and their corresponding odds arean probabilities of occurrence are shown below. The price of a ticket is $1.00. Find the mean and standard deviation of the payout.
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