Suppose that a company claims that its air fresheners last 23 days, on average. you take many large samples, and find, each time, that the mean number of days of the sample is outside the 95% confidence interval. based on this information alone, which of the following is probably not the mean number of days that the company's air fresheners last?
a. 19 b. 21 c. 23 d. 17

With #! i’ve tried to figure it out but i can’t.

Gabriel determined that his total cost would be represented by 2.5x + 2y – 2. his sister states that the expression should be x + x + 0.5x + y + y – 2. who is correct? explain.

Apolice office claims that the proportion of people wearing seat belts is less than 65%. to test this claim, a random sample of 200 drivers is taken and its determined that 126 people are wearing seat belts. the following is the setup for this hypothesis test: h0: p=0.65 ha: p< 0.65 find the p-value for this hypothesis test for a proportion and round your answer to 3 decimal places.