Question

For a chi-square test of a contingency table, the expected frequency for each cell is calculated assuming the two qualitative variables are independent of one another. True False Question 14 1 pts We draw a random sample of size 25 from a normal population with variance 2.2. If the sample mean is 18.5, what is a 90% lower limit confidence interval for the population mean?

Answer 1

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For a chi-square test of a contingency table, the expected frequency for each cell is calculated assuming the two qualitative variables are independent of one another.

TRUE

question 14

Solution From the given data, - Here, x = 18.5 (= 90%, n= 25, 6² -2.2,0 = 1.48324 There forre, Four mula forr confidence interval is = x t ze o Х un - where ZL is the z critical value for the (= 90% 2. = 1.645 -) 18.5 + 1.645 X 1.48324 s 25 -) 18.0120 U 18.9880, This we get con nfidence interval as follows 18.0 120 18.9880