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Describe when a z-test should be performed as opposed to a t-test? Which (if any) can we use all the time? Why or why not?
Statistics and Probability, Statistics
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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 ...
Buses run every 15 minutes along a certain route during rush hour. The time that a person would have to wait at a bus stop is uniformly distributed between 0 and 18 minutes. a. What is the probability that this person ha ...
What is the appropriate statistical analysis to use: t-test for two independent samples, t-test for dependent samples, ANOVA, or chi-square test of independence? Please identify and explain why it is appropriate. (a) A s ...
You are lost on the Mythy Island in the summer, when tourists are two-thirds of the population. If you ask a tourist for direction the answer is correct with probability ¾; answers to repeated questions are independent e ...
Jennifer currently has $500 in an account with an annual rate of return of 4.3%. She wants to have $6000 for a trip to Alaska when she graduates in 4 years. How much will she have to save each month to afford her trip?
Assume that the coin is weighted so that a tail is 6 times as likely as a head. The coin is flipped 9 times. 1) What is the probability that both heads and tails occur?
1. What is the YTM for a 14-year semi-annual bond that pays $35 every six months and has a purchase price of $980.000? Face value is $1,000. 2. A person wants to put aside $500 at the beginning of each month for 10 years ...
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 National safety council reported that 52% of American turnpike drivers are men. A sample of 300 cars traveling southbound on the New Jersey Turnpike yesterday revealed that 170 were driven by men. At a 99% level of c ...
Should you perform a log transformation on a categorical (nominal) variable, or can you only do that for continuous variables?
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