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blackwolf356Lv1
9 Sep 2020
A shoe store wants to estimate the average shoe size of their customers. It is assumed that the shoe size of their customers follows a normal distribution. It is known from previous experience that the standard deviation of shoe size is 2.4 inches. They take a sample of 40 customers and obtains the average shoe size of 10.3 inches from them. Estimate a 97% confidence interval for the population mean. 10.3 +/-
A company that sells pens knows that the number of days those pens last when used in an office is normally distributed with a standard deviation of 5 days. How many pens do they need to sample if they want to create a 95% confidence interval of the average number of days, with an error of +/- 2?
A shoe store wants to estimate the average shoe size of their customers. It is assumed that the shoe size of their customers follows a normal distribution. It is known from previous experience that the standard deviation of shoe size is 2.4 inches. They take a sample of 40 customers and obtains the average shoe size of 10.3 inches from them. Estimate a 97% confidence interval for the population mean. 10.3 +/-
A company that sells pens knows that the number of days those pens last when used in an office is normally distributed with a standard deviation of 5 days. How many pens do they need to sample if they want to create a 95% confidence interval of the average number of days, with an error of +/- 2?
alex357Lv3
4 Apr 2023
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