Question

In Exercise 3, (a) identify the claim and state Ho and Ha, (b) find the critical value(s) and identify the rejection region(s), (c) find the standardized test statistic z, (d) decide whether to reject or fail to reject the null hypothesis, and (e) interpret the decision in the context of the original claim. Assume the samples are random and independent, and the populations are normally distributed. 3. A researcher claims that the mean sodium content of sandwiches at Restaurant A is less than the mean sodium content of sandwiches at Restaurant B. The mean sodium content of 22 randomly selected sandwiches at Restaurant A is 670 milligrams. Assume the population standard deviation is 20 milligrams. The mean sodium content of 28 randomly selected sandwiches at Restaurant B is 690 milligrams. Assume the population standard deviation is 30 milligrams. At a -0.05, is there enough evidence to support the claim?

Answer 1

Here,we apply test for equality population means using z test satistic.

answer with steps given below.

Given nı-22 , 670 Reskasrapt A lesse of Rostauao На p The null hypotbesis is Ha け. 广1 (eA2 rla altern ahve hypothesis is Aa: valul is65 Re echan egon 4-1-G5 KIGS -o.GS o 20)2 30)2 d) Sioe 0つ e) 1eu is sufficient evide)ce to upPH. at Rastamaot B.