Question
please help
The manager of a grocery store has taken a random sample of 100 customers. The average length of time it took the customers in the sample to check out was 3.1 minutes with a standard deviation of 0.5 minutes. We want to determine whether or not the mean waiting time of all customers is significantly more than 3 minutes. Using alpha = 05, is the mean waiting time significantly more than 3 minutes? a. Yes, because we reject the null hypothesis b. Yes, because we do not reject the null hypothesis c. No, because we reject the null hypothesis d. No, because we do not reject the null hypothesis. A Quinnipiac University poll conducted on September 17-21, 2015 determine that 45% of Americans favored gun control laws in the US. A study was performed yesterday, and 39 out of 100 people favored stricter gun control laws. You decide to use a 09 significance level in answering the question, "Has the percentage to people who favor gun control laws changed since the poll was taken? Use the p-value approach to perform this hypothesis test. a. The percentage has changed because 1131 > 09
Explanation / Answer
Answer - 5:
The statistical software output for this problem is:
One sample T summary hypothesis test:
: Mean of population
H0 : = 3
HA : > 3
Hypothesis test results:
Hence,
Option A is correct.
Mean Sample Mean Std. Err. DF T-Stat P-value 3.1 0.05 99 2 0.0241
