ConfidenceIntervals

1. (a)AFisheriesOfficerwantstoestimatethemeanweightofcodfishcaughtonaparticularday. Sherandomly selected 21 codfish caught that day and found thesamplemean to be8.12 kg per fish with a sample standard deviation of 1.85 kg per fish.Construct a 90% confidence interval for the mean weight of codfish caught on that day.Assume the weight of codfish in the population is normally distributed.

(b)UsingExcel,Formulas,MoreFunctionsfind(confirm)theMarginofErrorfortheabove confidence interval.Submit your output

Note: On the hypothesis testing questions you must use the five-step process outlined in Section 9.4 in our text.Make sure you make a statement at the end of each hypothesis test about the result of your test (ie. Don't just say for example"Reject the null", at the end of yourtest,youwouldsaysomethinglike"Rejectthenull,thereforethemeansalaryofdoctors in NL is greater than $105,000")

HypothesisTesting(OneSample-- mean)

1. a) Netflix Canada stated that their customers spend, on average, 10.3 hours streaming movies per week.A local television station believes that Netflix Canada's customers stream less than what Netflix Canada has stated.The local television company randomly selected 88 Netflix customersandfindsthesamplemeanstreamingtimetobe9.7hourswithapopulationstandard deviation of 2.0 hours. Using hypothesis testing, can the local television station conclude the population mean time streaming for Netflix Canada's customers is less than 10.3 hours per week at the 0.02 significance level?

b)Aftercompletingthehypothesistest,calculatethep-valueandcomparethistothelevelof significance, what can you conclude?