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Please help me with answering the below questions. I have attached the formula and standard table. Only manual working out or excel are to be

Please help me with answering the below questions. I have attached the formula and standard table. Only manual working out or excel are to be used for these qs. The questions are as follows:

A market research firm is hired to estimate the percent of students who have a tablet. They take a
sample of 250 students and finds 42 own a tablet. Compute a 95% confidence interval for the true
proportion of students who own a tablet.

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