27 May Question 1. Question : The manager of the quality department for a tire
Question
1. Question : The manager of the quality department for a tire manufacturing company wants to study the average tensile strength of rubber used in making a certain brand of radial tire. The population is normally distributed and the population standard deviation is known. She uses a Z test to test the null hypothesis that the mean tensile strength is less than or equal to 800 pounds per square inch. The calculated Z test Statistic is a positive value that leads to a p-value of .067 for the test. If the significance level is .10, the null hypothesis would be rejected.
Student Answer: True
False
2. Question : For the chi-square goodness of fit test, the rejection point X2a is in
Student Answer: the left tail of a chi-square curve.
both the left and right tails of a chi-square curve.
the right tail of the appropriate F curve.
the right tail of a chi-square curve.
3. Question : Consider using p-value to test H0 versus Ha by setting ? equal to .10. We reject H0 at level ? of significance if and only if the p-value is:
Student Answer: Greater than ?/2
Greater than ?
Less than ?
None of the above
4. Question : Type II error is defined as the probability of ______ H0 , when it should _____
Student Answer: failing to reject, be rejected.
failing to reject, not be rejected.
rejecting, not be rejected.
rejecting, be rejected.
5. Question : The X2 statistic is used to test whether the assumption of normality is reasonable for a given population distribution. The sample consists of 5000 observations and is divided into 6 categories (intervals). The degrees of freedom for the chi-square statistic is:
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