STATISTICS and PROBABILITY

The net weight of a packet of a snack is 130 g. A sample of 80 packets yielded a sample mean weight of 112 g with a standard deviation of 15 g. What is the null hypothesis of the problem?

The average height of senior high female student is 160 cm. The mean height of a sample of 100 female students is 163 cm with a standard deviation of 6 cm. What is the alternative hypothesis of the problem?

Suppose it is the Christmas season and Janine thinks that is it the month of February, what error is she committing?

• Type A error

• Type B error

• Type I error

• Type II error

What type of error is occurred in decision making when the true hypothesis is rejected?

• Type II

• Type I

• Type B

• Type A

What test is used when the sample size is below 30 and the population standard deviation is unknown?

• t-test

• F-test

• Chi-square

• z-test

The figure shows a normal curve with its rejection region shaded. The dot shows the calculated test statistic. Is the test one tailed or two tailed?

• The test is one-tailed, left tail

• The test has no tail

• The test is one-tailed, right tail

• The test is two tailed

What statement states that there is no difference between two parameters?

• Alternate hypothesis

• Null Hypothesis

• Alternative Hypothesis

• Void hypothesis

When is the null hypothesis rejected?

• If the test-statistic value falls outside the rejection region

• If the test-statistic value falls within the rejection region

• If the test-statistic falls to the left of the rejection region

• If the test-statistic falls to the right of the rejection region

Which of the following terms should be used to complete the statement, 'In a two- sample test of means for independent samples, the equal sign always appears in the ____________.'?

• Null hypothesis

• Alternate hypothesis

• Left tail of the test statistic

• Right tail of the test statistic