Determining the estimate of the true proportion
When 325 college students are randomy selected and surveyed, its found that 117 own cars. Construct a 99% confidence interval estimate of the true proportion of all college students who own cars.
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What is the probability that a baby is born between 5:15 and 5:25, given that it was born between 5:00 and 6:00?
The following frequency distribution presents a set of exam scores for a class of N = 20 students. What is the percentile rank for X = 90?
The concept of Type I and Type II Error is critical and will come into play with each and every statistical test you perform. Discuss the implications of making both a Type I and Type II error.
Suppose the probability distribution X= number of jobs held during the past year. Find the probability that a randomly selected student held two or few jobs during the past year.
A random sample of discount prices gives the following prices: 221, 286, 290, 330, 310, 250, 270, 280, 299, 265, 291, 275, and 281. At one percent level of significance, can you conclude that the mean fare has increased?
If 10 employed women are selected at random, what is the probability that exactly 2 have never been married? Give answer with 4 decimals.
Under what circumstances should you use a grouped frequency distribution instead of a regular frequency distribution?
If we are testing for the difference between the means of 2 related populations with samples of n1 = 20 and n2 = 20, the number of degrees of freedom is equal to
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