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Q8. Phone calls received by a Police dept. are normally distributed. A random sample of 16 days showed that the dept. received an average of 260 phone calls per day with a sample standard deviation of 31 calls. (10 points) a. Find a 95% confidence interval for the mean number of phone call received each day (3 point) b, without computing the 90% CI, can you draw a conclusion (still testing whether the mean # of phone calls is 220) at the 1% significance level? (3 point) c. What is the statistical power of this test in question (b) suppose the real mean of number of calls is 219? (use CLT in this question, 4 point)

math   Statistics-And-Probability   
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Q-81 Phone calls acceived by a Polrce ep are normall dist ibuted. A random Sample of 16 days Showed the+ the dept. received an avergge of 26 o Phone culis per dary with a Sampie stanca nd devsetion oP Anyuey Normaly distibuted >andom 8umple of lo days Showed thut the dept eceived an av of 223 Phone calls Calis n-16, 223, σ-31 number of phene coills >eceived each do The mesn 2 Jn 223 _ IS. I. 2.23-1SAg ctween 207-8I to 238 19

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