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Thirty-five sophomores, 39 juniors and 29 seniors are randomly selected from 475 sophomores, 517 juniors and 550 seniors at a certain high school. What sampling technique is used?
Statistics and Probability, Statistics
Matterhorn, Inc. had the following sales for the past six months. Matterhorn collects its credit sales 30% in the month of sale, 60% one month after the sale, and 10% two months after the sale. Cash Sales Credit Sales Ja ...
What is the probability of a value from a normal distribution being between 0.75 standard deviations above the mean and 1.75 standard deviations below the mean? (Round calculations to nearest thousandth (3 digits))
Mort is to pay off a loan of $75,000 with equal payments at the end of every month over 10 years (i.e., 120 months). The ANNUAL effective rate is 5%. Mort decides that he can actually manage to pay double the monthly pay ...
New York graduates tend to leave the state after graduating. A study asked the students of NYU "Are you planning to stay in NY after graduation?" In the sample, only 37% answered yes. The study explained that with a 95% ...
Consider a machine with exponential reliability model. Assume that the breakdown rate is 1 and the repair rate is 2. Calculate the probability that the machine is up for more than 10 units of time. Calculate the probabil ...
One hundred twenty-five marine recruits participated in a study to assess the benefits of a strength training program. Each recruit was given a push-up test at the beginning and end of the program. The change in number o ...
A local postal carrier distributes first-class letters, advertisements, and magazines. For a certain day, she distributed the following number for each type of item. Delivered to First Class Letters Ads Magazines Home ...
Sixty-seven percent of adults have looked at their credit score in the past six months. If you select 31 customers, what is the probability that at least 20 of them have looked at their score in the past six months?
The mean throwing distance of a football for a Luis, a high school freshman quarterback, is 50 yards, with a standard deviation of three yards. The team coach tells Luis to adjust his grip to get more distance. The coach ...
Assume a firm has $45 million in operating profit. The firm's tax rate is 40%. What is the tax shield of the firm's $38 million in debt that charges a 10% interest rate?
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