Question

1. When 385 junior college students were surveyed, 170 said that they have previously 1). owned a motorcycle. Find a point estimate for p. the population proportion of students who have previously owned a motorcycle. A) 0.558 B) 0.442 C) 0.306 D) 0.791 2. True or False: The general form of a large-sample (1 - a) 100% confidence interval 2) p(1-P) for a population proportion pis ptz, where p = is the sample proportion of observations with the characteristic of interest. 11 A) False B) True 3. Suppose a 90% confidence interval for u turns out to be (1000, 2100). If this interval 3). was based on a sample of size n = 25, explain what assumptions are necessary for this interval to be valid. A) The sampling distribution must be biased with 24 degrees of freedom. B) The population must have an approximately normal distribution C The sampling distribution of the sample mean must have a normal distribution D The population of salaries must have an approximatet distribution

Answer 1

Solution - point estimate : 170 385 0.442 True 3) B Since sample size is small The population must be approxiconally normal distribution. 4) your friends is correct and you are gol. certain. A m-l in dot 7) ei= 14.7 B because it is the Parameter meon of all Ford cars. 8 Ho: l = 50.2 . Н. so B There M = 50.2 Ho is rejected is sufficient evidence to reject the claim Let tailed test, Two tailed a B 10)