Does buying CDs depend on whether you own a smartphone or not? A survey asks a group of students if they buy CDs or not. It also asks if the students own a smartphone or not. The data are recorded in the contingency table below, and a chi- Square Test of Independence at the 1% significance level is performed No CDs 23 7 30 Row Total 37 24 61 CDs Smartphone No Smartphone Column Total 31 T Help Copy to Clipboard Download CSV (a) The null and alternative hypotheses are: Ho: The two variables are independent, so owning a smartphone does not affect buying CDs . Ha: The two variables are dependent, so owning a smartphone does affect buying CDs. (b) Compute the test statistic, rounded to one decimal place. (Use expected frequencies that are also rounded to one decimal place.) Provide your answer below:

Q: Mean and median

A: N/A

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Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.