Part 1 true or false

1.Sample mean is a statistic.

2.Type II error in testing hypothesis is denoted by the Greek letter alpha.

3. Given : A real estate agent claims that 60% of all condominium units built today are studio-type. Test the claim using 99% confidence level. The probability of committing a type I error is 0.1 *

True

False

4. The level of significance is the same as the confidence level. *

True

False

5.The Alternative Hypothesis is the testable hypothesis denoted by H .

True

False

6. The type I error in hypothesis testing is committed when one fails to reject a false null hypothesis. *

True

False

7. If t(computed) = 1.19 and t(critical) = 1.3 , then reject H . *

True

False

8. In Hypothesis Testing the z-test is used when population standard deviation or population variance is unknown and the sample size n is greater than or equal to 30.

True

False

9.The type II error is the allowable error.

True

False

10.Given the problem: A random sample of 150 male adults showed a mean IQ of 105. If it is known that the IQs of male adults have a standard deviation of 12, construct a 97% confidence interval estimate of the mean IQ of all male adults. Then : =105, =12 , n=150 .

True

False

Part 2

1.A research has a theory that the average age of managers in a particular industry is over 25 - years-old, and he wishes to prove this. The null hypothesis to conduct a statistical test on this theory would be _____.

A.The population mean is 25

B.The population mean is 25

C.The population mean is = 25

D The population mean is > 25

2. A company produces an item that is supposed to have a seven inches' hole punched in the center. A quality control inspector is concerned that the machine which punches the hole is "out-of-control" (hole is too large or too small). In an effort to test this, the inspector is going to gather a sample punched by the machine and measure the diameter of the hole. The alternative hypothesis used to determine if the machine is out-of-control is_______ .

A. the mean diameter is > 7 inches

B. the mean diameter is < 7 inches

C. the mean diameter is 7 inches

S. the mean diameter is not 7 inches

3. In a two-tailed hypothesis about a population mean with =0.05, the rejection region would be ___.

A. z > 1.64

B. Z > 1.96

C. z < -1.96 and z >1.96

D. z < -1.64 and z > 1.64

4. A Type II error is committed when ______ .

A we reject a null hypothesis that is true.

B.. we don't reject a null hypothesis that is true.

C. we reject a null hypothesis that is false.

D. we don't reject a null hypothesis that is false

5.A Type I error is committed when *

A.we reject a null hypothesis that is true.

B. we don't reject a null hypothesis that is true.

C.we reject a null hypothesis that is false.

D.we don't reject a null hypothesis that is false

6. If a test of hypothesis has a Type I error probability () of 0.01, we mean

A. if the null hypothesis is true, we don't reject it 1% of the time.

B. if the null hypothesis is true, we reject it 1% of the time.

C. if the null hypothesis is false, we don't reject it 1% of the time.

D.. if the null hypothesis is false, we reject it 1% of the time.

7. A pharmaceutical company claims that its weight loss drug allows women to lose 8.5lb after one month of treatment. If we want to conduct an experiment to determine if the patients are losing less weight than advertised, which of the following hypotheses should be used? *

A. H: 8.5; H: < 8.5

B . H: = 8.5; H: 8.5

C H: 8.5; H: = 8.5

D. H: 8.5; H: > 8.5

8. Given that z computed = 1.9 and z critical = 1.64 . What should be the appropriate decision ? *

A. Reject H.

B.Do not reject H.

C.Reject H.

D.Do not reject H

9. Given: t computed = 1.65 , confidence level = 90% , two-tailed , n=20, critical value is 1.328. What should be the appropriate decision? *

A.Reject H.

B.Do not reject H.

C.Reject H.

D. Do not reject H

10. Estimate the mean consumption of 5 families in one month if their expenses are Php 10,500, Php 17,000, Php 21,500, Php 15,000 and Php 14,000.

A.Php 15,200

B.Php 15,400

C. Php 15,600

D. Php 15,800

11. In a normal distribution, 95% of the scores are within + or -

A. One standard deviation of the mean.

B. Two standard deviations of the mean.

C.Three standard deviations of the mean

D. Four standard deviations of the mean.

12. The standard deviation of a statistic is called

A. standard error

B. sampling error

C.quartile

D. confidence interval

13. Which of the following is an example of a null hypothesis? *

A. Motivation is related to achievement.

B. Motivation is not related to achievement.

C. Highly motivated people are more likely to be successful than those with low motivation.

D. Highly motivated people are less likely to be successful than those with low motivation.

14. If a researcher rejects a true null hypothesis, the researcher either

A.is incorrect, or made a Type I error

B.is correct, or made a Type I error

C.is incorrect, or made a Type II error

D.is correct, or made a Type II error

15. The probabilities used for hypothesis testing are accurate for making generalizations to a population when

A.the sample size is large

B. confidence intervals cannot be constructed

C. the significance level is small

D. samples are random

16. When n < 30 and the population standard deviation is not known, what is the appropriate Test statistic to use? *

A. z

B. t

C. r

d.

17. Which is a two- tailed, alternative hypothesis?

A. There is no significant relationship between the IQ level and academic performance of the students.

B. The average hours of study period of a scholar student is less than 5 hours.

C. The average daily income of a load retailer is not equal to PHP 15,000.

D. The average marrying age of a woman is greater than 25 years.

18. What do you call processes involved in making conclusions about population values?

A. estimating parameters

B. inferential statistics

C. hypothesis testing

D. descriptive statistics

19. Which is a null hypothesis? *

A.The average IQ of students in a university is greater than 93.

B.The average incentive of a book agent is less than PHP 15,000.

C.There is a significant difference in the mean scores of male and female.

D. The average monthly income of a household in Barangay A is equal to PHP 10,000.

20. A test that the rejection region is located on both end of the distribution. *

A. one -tailed test

B.Two- tailed test

C.Alternative Hypothesis

D.Null Hypothesis

21. A test is used for testing hypothesis when the population standard deviation is known and /or sample size is greater than or equal to 30.

A. t - test

B.z - test

C. correlation

D. Regression

22. Which is not an alternative hypothesis? *

A.Method A is less effective than method B.

B.Method A is more effective than method B.

C. There is a significant difference between the effectiveness of method A and method B

D. There is no significant difference between the effectiveness of method A and Method B.