Use the given information to find the minimum sample size re

Use the given information to find the minimum sample size required to estimate an unknown population mean mu. 25) How many students must be randomly selected to estimate the mean weekly earnings of students, 25) at one college? We want 95% confidence that the sample mean is within 52 of the population mean, and the population standard deviation is known to be $10. A)6$ 11) 136 C) 85 D) 97 S11ORT ANSWER. Write the word or phrase that best completes each statement or answers the question. Provide an appropriate response. 26) Under what circumstances can you replace a with sin the formula E= z

Solution

Sample size should be atleast 68

Hence option a

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s can replace sigma provided normal conditions are satisfied and sample size is sufficiently large.

And also when population std deviation cannot be calculated.