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Question: A study of 35 golfers showed that their average score was 92. The standard deviation of the sample was 5.
a) Find the best point estimate of the mean.
b) Find the 95% confidence interval of the mean score for all golfers.
c) Find the 95% confidence interval of the mean score if the sample of 60 golfers is used.
d) Which interval is smaller? Explain why.
How do you classify statistical findings in order of power: nominal, ordinal, interval, and ratio? Give example by making up values.
A real estate agent wants to compare the variation in the selling price of homes on the oceanfront with those 3 blocks away A sample of 21 oceanfront homes sold within the last year revealed the standard deviation of the selling prices was 45,600.
Carefully define a standard normal distribution. Why does a researcher want to go from a normal distribution to a standard normal distribution? Explain.
Polls showed the two main candidates in 2004 presidential election were nearly tied on the day before the election. To predict the winner a newspaper would like to have a poll that has a margin of error of less than 1%.
If a simple random sample of 75 MBA graduates is to be taken. What is the probability that the sample mean salary will exceed $82,500?
if we are testing for the difference between the means of 2 related populations with samples of n1 20 and n2 20 the
an airline knows from experience that the distribution of the number of suitcases that get lost each week on a certain
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Uniformly distributed in the interval -0.5 cents to 0.5 cents. What is the probability that the round-off error exceeds 0.3 cents or is less than -0.3 cents?
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If you buy a box of Wisk, the probability of getting a scoop is 97%. If you buy 9 boxes over the next several months, what is the probability of missing two scoops?
Two samples of sizes 25 and 35 are independently drawn from two normal populations, where the unknown population variances are assumed to be equal.
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