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Last fall, a sample of n = 36 freshman was chosen to participate in the new 4-hour training program designed to improve study skills. To estimate effectiveness of the new program, sample was compared with rest of freshman class. All freshman should take same English Language Skills course, and mean score on the final exam for entire freshman class was µ = 74. Students in new program had mean score of M = 79.4 with standard deviation of s = 18.
a. On basis of these data, can college conclude that students in new program performed significantly better than rest of freshman class? Use a one-tailed test with α = .05.
b. Can college conclude that students in new program are significantly different than rest of the freshman class? Use a two-tailed test with α = .05
An airline tracks data on its flight arrivals. Over the past six months, 65 flights on one route arrived early, 273 arrived on time, 218 were late, and 44 were cancelled.
What critical value should the company officials use to determine the rejection region?
If the voice identifications were made by random guess, find the probability that all 9 victims would select the same person?
Forty percent of the homes constructed in the Quail Creek area include a security system. Three homes were selected at random. What is the probability all three homes selected have a security system?
Which of the following assumptions is not made for the F-test for comparing three or more means?
Modify above problem (Problem 8th) so that each hardware vendor now demands seventy-five (75) units. Any units available from the vendors that are not shipped cost nothing.)
The probability is 90% that the sample percentage will be contained within what symmetrical limits of the population percentage?
Determine percent of the garages take between 29 hours and 34 hours to erect? Determine percent of garages take 28.7 hours or less to erect?
The IQ scores of 30 children from under-privileged households, were measured before and a year after, a program of nutritional supplementation was instigated at a primary school.
Why do we do power calculations with single sample z test? A) Because we can use Z area tables to calculate the power. B) Because comparing a sample mean against a population mean is very powerful
The running time for videos is normally distributed with mean 390 and standard deviation 148. suppose a sample of 40 videos are selected, what is the probability that the mean running time of the sample exceeds 360 seconds?
Someone gives you 10 to 1 odds that you cannot roll a double number with the roll of a pair of dice. You win $10 if you succeed and you lose $1 if you fail. What is the expected value of the game for you? What can be expected if you play 100 times..
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