Question: Suppose that in a large class the instructor announces that
Suppose that in a large class. the instructor announces that the average grade on an exam is 75. Which is more likely to be closer to 75: i. The exam grade of a randomly selected student in the class? ii. The mean exam grade of a sample of 10 students? Explain. S. Consider the formula for the standard deviation of the sampling distribution of p given by What happens to the standard deviation as n gets larger and larger? Explain what this means in terms of the spread of the sampling distribution.
Answer to relevant QuestionsExplain how to decide when it is appropriate to use the normal approximation to the binomial distribution. Using the same method as for the first sample. estimate the proportion of cans that will fail at a pressure of 90 or less. Leaking tanks: Leakage from underground fuel tanks has been a source of water pollution. In a random sample of 107 gasoline stations, 18 were found to have at least one leaking underground tank. a. Find a point estimate for ...Cost of repairs: Refer to Exercise 8. Assume the population is normal. Construct a 95% confidence interval for the population standard deviation. . How many TV sets? A survey organization sampled 60 households in a community and found that the sample mean number of TV sets per household was 3.1. The population standard deviation is a = 1.5. Can you conclude that the ...
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