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Sladkaya [172]
3 years ago
14

Suppose scores on exams in statistics are normally distributed with an unknown population mean and a population standard deviati

on of three points. A random sample of 36 scores is taken and gives a sample mean of 68. Find a 85 % confidence interval estimate for the population mean exam score. Explain what the confidence interval means​
Mathematics
2 answers:
saw5 [17]3 years ago
7 0

Step-by-step explanation:

67.18,68.82

Let mu be the true population mean of statistics exam scores. We have a large random samples of n=36 scores with a sample mean of 68.we know that the population standard deviation is sigma=3.A pivotal quantity is 3^sqrt(36)=(3/6)=68(1/2) which is approximately normally distributed. Therefore the 85%confidence interval is 68-(1/2)(1.6449), 68+(1/2)(1.6449) i.e (67.18,68.82)

Gnom [1K]3 years ago
5 0

this the answer of queastions

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