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A random sample from a normal population yields the following 25 values:
90 87 121 96 106 107 89 107 83 92
117
93
98
120
97 109 78
87 99 79
104
85
91
107
89
(a) Calculate an unbiased estimate σˆ 2 of the population variance.
(b) Give approximate 99% con?dence interval for the population variance.
(c) Interpret your results and state any assumptions you made in order to solve the problem.
a car agency sells 50 of its inventory of a certain foreign car equipped with side airbags. let x be the number of cars
1.there are two statistics classes. the first has 250 students and the second has 200 students. in the first class the
In a certain city, there are 100,000 persons age 18 to 24. A simple random sample of 500 such persons is drawn, of whom 198 turn out to be currently enrolled in college.
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Use the critical values for z of 1.65 and a p level of approximately 0.10, or 10%. For each of the following values, determine if you would reject or fail to reject the null hypothesis:
the mass of a species of shrew is approximately normally distributed with a mean of 10 grams and a standard deviation
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The mileage per day is distributed normally. Find the probablitly that a truck drives at least 133 miles in a day. Round your answer to 4 decimal places.
This exercise is a "what if analysis" designed to determine what happens to the test statistics and interval estimates when elements of the statistical inference change.
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