RES 342 FINAL EXAMINATION (A+ Guaranteed)

RES/342 FINAL EXAMINATION

1. For which of the following values of the smoothing constant a will the smoothed series catch up most quickly whenever the original time series changes direction?

a. 0.40

b. 0.50

c. 0.90

d. 0.10

2. From the coefficient of multiple determination, we cannot detect the strength of the relationship between the dependent variable y and any individual independent variable.

a. True

b. False

3. When using the least squares method, the column of residuals always sums to zero.

a. True

b. False

4. In a simple linear regression model, testing whether the slope B1 of the population regression line could be zero is the same as testing whether or not the population coefficient of correlation p equals zero.

a. True

b. False

5. If the Durbin-Watson statistic has a value close to 0, which assumption is violated?

a. Independence of errors

b. Normality of the errors

c. Homoscedasticity

d. None of these

6. Statistical methods that requires few assumptions, if any, about the population distribution are known as

a. Free agent techniques

b. Nonparametrics techniques

c. Parametrics techniques

d. All of these

7. A random variables follows the student’s t distribution. The probability that it will be positive is

a. less than 0.50

b. 0

c. 1

d. .50

8. The use of the student’s t distribution requires which of the following assumptions?

a. The population is normal

b. The sample is drawn from a positively skewed distribution

c. The sample size is greater than 30

d. The population variance is known

9. In two-factor ANOVA, the MSE must always be positive, but MSA or MSB may be negative

a. True

b. False

10. Main effects are simpler to interpret when the test of the interaction term is not significant in a two-factor ANOVA.

a. True

b. False

11. When the problem objective is to compare more than two populations, the experimental design that is the counterpart of the match pairs experiments is called randomized block design

a. True

b. False

12. If a sociologist wishes to determine if there is evidence that average family in a community exceeds $47,000 a two-tailed test should be used.

a. True

b. False

13. 100 women were polled and 60 reported succesfully communicating an automobile problem to an auto repairman. A sample of 150 men had 95 reporting the same success. The value of the test statistic for a test of a equality of proportions is

a. -0.419

b. 0. 2702

c. -0. 5319

d. 0. 7293

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RES 341 WEEK 5 QUIZ (A+ Guaranteed)

RES/341 WEEK 5 QUIZ

1. Suppose 70% of North Carolina drivers use their seat belts. A sample of
10 drivers is pulled by the police. What is the probability that exactly 7
drivers are wearing seat belts?

a. 0.700
b. 0.895
c. 0.267
d. 0.215

2. Which of the following is correct statement about confidence intervals?

a. They cannot contain negative numbers.
b. They are always based on the z distribution
c. They must always include the population parameter.
d. None of the above are always correct.

TRUE/FALSE

1. In the test of a statistical hypothesis, if z calculated is less than positive z critical or greater than negative z critical, one rejects Ho and accepts H1.

2. Alpha (Probability of Type I error) should always be set at 0.05.

3. A telemarketer makes six phone calls per hour and is able to make a sale
on 30 percent of these contacts. During the next two hours, find:

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RES 341 WEEK 5 DQ 3 WAGES FROM A STATISTICAL STANDPOINT, WAS THERE A TYPE ERROR MADE (A+ Guaranteed)

RES/341 WEEK 5 DQ 3 WAGES

A significance test is used to prevent a machine from under filling or overfilling quart bottles. On the basis of a sample, the null hypothesis is rejected and the machine is shut down for inspection. A thorough examination reveals that there is nothing wrong with the filling machine. From a statistical standpoint, was there a type error made? If yes, which type? Explain.

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RES 341 WEEK 5 DQ 3 WAGES (A+ Guaranteed)

RES/341 WEEK 5 DQ 3 WAGES

A significance test is used to prevent a machine from under filling or overfilling quart bottles. On the basis of a sample, the null hypothesis is rejected and the machine is shut down for inspection. A thorough examination reveals that there is nothing wrong with the filling machine. From a statistical standpoint, was there a type error made? If yes, which type? Explain.

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RES 341 WEEK 5 DQ 2 WAGES DISCUSS THE CONCLUSION AS A TYPE I ERROR, A TYPE II ERROR (A+ Guaranteed)

RES/341 WEEK 5 DQ 2 WAGES

A man on trial is accused of murder in the first degree. The prosecutor presents evidence that he hopes will convince the jury to reject the hypothesis that the man is innocent. This situation can be modeled as a significance test with the following hypotheses:

Ho: The defendant is innocent.

H1: The defendant is not innocent.

Suppose that the null hypothesis is rejected and that an alternate hypothesis is accepted. Discuss the conclusion as a type I error, a type II error, or a correct decision—if in fact the defendant is innocent.

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RES 341 WEEK 5 DQ 2 WAGES (A+ Guaranteed)

RES/341 WEEK 5 DQ 2 WAGES

A man on trial is accused of murder in the first degree. The prosecutor presents evidence that he hopes will convince the jury to reject the hypothesis that the man is innocent. This situation can be modeled as a significance test with the following hypotheses:

Ho: The defendant is innocent.

H1: The defendant is not innocent.

Suppose that the null hypothesis is rejected and that an alternate hypothesis is accepted. Discuss the conclusion as a type I error, a type II error, or a correct decision—if in fact the defendant is innocent.

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RES 341 WEEK 5 DQ 1 WAGES WHY CAN THE NULL HYPOTHESIS NOT BE PROVED (A+ Guaranteed)

RES/341 WEEK 5 DQ 1 WAGES

Suppose that you perform a significance test regarding a population mean and that the evidence does not warrant rejection of the null hypothesis. When formulating the conclusion to the test, why is the phrase fail to reject the null hypothesis more accurate than the phrase accept the null hypothesis? Why can the null hypothesis not be proved? Explain.

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RES 341 WEEK 5 DQ 1 WAGES (A+ Guaranteed)

RES/341 WEEK 5 DQ 1 WAGES

Suppose that you perform a significance test regarding a population mean and that the evidence does not warrant rejection of the null hypothesis. When formulating the conclusion to the test, why is the phrase fail to reject the null hypothesis more accurate than the phrase accept the null hypothesis? Why can the null hypothesis not be proved? Explain.

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RES 341 WEEK 4 DESCRIPTIVE STATISTICS PAPER (TEAM PAPER) WAGE AND WAGE EARNERS (A+ Guaranteed)

RES/341 WEEK 4 DESCRIPTIVE STATISTICS PAPER (TEAM PAPER) WAGE AND WAGE EARNERS

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RES 341 WEEK 4 E TEXT-INDIVIDUAL ASSIGNMENT TEACHER (A+ Guaranteed)

RES/341 WEEK 4 E TEXT-INDIVIDUAL ASSIGNMENT TEACHER

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