The waiting times (in minutes) of a random sample of 21 people at a bank have a sample standard deviation of 4.5 minutes. Construct a confidence interval for the population variance o² and the population standard deviation o. Use 90% level of confidence. Assume the sample is from a normally distributed population.

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A: Given , The population mean ( n )   = 75 ,  the population standard deviation ( σ )= 6

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A: To find the standard error of the mean.Given that,

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A: Answer:-

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Q: Scores on the SAT test have a mean of 1518 and a standard deviation of 325. If 100 students are…

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Q: 32 individuals from a population and the mean of the population is 120 and the standard deviation of…

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Q: Assume that adults have IQ scores that are normally distributed with a mean of 100 and a standard…

A: Introduction: If P4 denotes the 4th percentile, then observations lie below P4 with 4% or 0.04…