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A sample of 35 golfers showed that their average score on a particular golf course was 80 with a standard deviation of 10.Answer each of the following (show all work):
(A) Find the 99% confidence interval of the mean score for all 35 golfers.(B) Find the 99% confidence interval of the mean score for all golfers if this is a sample of 50 golfers instead of a sample of 35.(C) Which confidence interval is larger and why?
Use Chebyshev's theorem to find what percent of the values will fall between 120 and 150 for a data set with mean of 135 and standard deviation of 7.5.
Standard deviation of 19.5. Use a 0.05 significance level to test the claim that the sample comes from a population with a standard deviation less than 23.4.
Determine critical value for boundary of the rejection region (i.e., Zα).
The normal distribution has several characteristics that make it the underlying foundation of much of inferential statistical tools.
The best measure of central tendency for this scenario would be to use median as it is not affected by extremely large values.
A large internet retailer, is studying the lead time (elapsed time between when an order is placed and when it is filled) for a sample of recent orders. The lead times are reported in days.
A local tire dealer wants to predict the number of tires sold each month. He believes that the number of tires sold is a linear function of the amount of money invested in advertising.
Simplifying a sum of radical expressions. Simplify the following expression as much as possible:
An economist found that a random sample of 42 high school teachers had an average annual salary of $56,490. A previous study showed that the population standard deviation is $4150. Find the 99% confidence interval for µ, the average annual salary ..
Assume that the two tests use different scales to measure the same aptitude. If someone gets a SAT score that is the 67th percentile, find the actual score and the equivalent ACT score.
If random sample of thirty six customer transactions points out that sample mean withdrawal amount is $172, is there evidence to think that population mean withdrawal amount is no longer $160? Determine the mean of data above?
A student is selected at random and found to have a GPA of less than 2.5, what is the probability that the student is from a private school?
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