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You work for a large retailer and have been asked to estimate the proportion of your customers that are less than 30 years old. You have sampled a large number of stores and have found that of the 181 customers you have surveyed, 45 are less than 30 years old.
Assuming your sample is valid, what is the upper bound of a 95% confidence interval for the population proportion of customers who are less than 30 years old? (Report your answer as a decimal and not as a percentage. For example, report 0.052 rather than 5.2%.).
for a lawyer 10 clients come to see her on average every day. the time of talking to each customer follows an
Table 7.24 is based on automobile accident records in 1988, supplied by the state of Florida Department of Highway Safety and Motor Vehicles. Subjects were classified by whether they were wearing a seat belt, whether ejected, and whether killed.
Write the equation of the line of regression for estimating High Jump from Long Jump.- Interpret the slope of the line.
A survey of licensed drivers inquired about running red lights. One question asked, "Of every ten motorists who run a red light, about how many do you think will be caught?"
question random sampling from two normal populations produced the following resultsx1
A ski gondola carries skiers to the top of a mountain. It bears a plaque stating that the maximum capacity is 14 people or 2324 lb. That capacity will be exceeded if 14 people have weights with a mean greater than 2324 lb/14 = 166 lb. Assume that..
Suppose that the mean weight for men 18 to 24 years old is 170 pounds, and the standard deviation is 20 pounds. In each part, find the value of the standardized score (z-score) for 200 pounds , 140 pounds, 170 pounds and 230 pounds.
Construct a box plot using a graphing calculator for each data set, and state which box plot has the wider spread for the middle 50% of the data.
Find a 95% confidence interval for the true variance in relative humidity in Phoenix.- Is there any evidence to suggest the data are from a non-normal distribution? Justify your answer.
A simple random sample of 92 adults is chosen. Find the 42 percentile for the sample mean. Round to one decimal place.
A sample of 200 such candies is randomly selected. Find the mean and the standard deviation for the number of orange candies in such groups of 200.
consider the following regression modelsalaryin 1000 20 2x 5z 0.7xzwhere x is the number of years of experience
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