drop dwon options

1:

right-tailed

left-tailed

two-tailed

2:

T-test for the population mean

Z-test for the population mean

Z-test for the population proportion

T-test for the population proportion

3:

1.753

1.761

2.145

1.960

1.645

2.131

4:

0.79

-0.79

-2.20

2.20

1.85

5:

YES

NO

For the past few years, the number of customers of a drive-in bottleshop has averaged 20 per hour. This year, another bottleshop 1 km away opened a drive-in service. The manager of the first shop believes that this will result in a decrease in the number of customers. A random sample of 15 hours showed that the mean number of customers per hour was 18.3, with a standard deviation of 3 per hour. Assume that the number of customers of the drive-in bottleshop is approximately normal. Can we conclude at the 5% level of significance that the manager's belief is correct? (Use the critical value approach.) Answer the following questions: 1. This is a [Select] 2. The test is a [Select] hypothesis test. [Select] 3. The critical value of the test is 4. The value of test statistic is [Select] 5. From the above values, is there enough evidence to reject the null hypothesis Ho? [Select]