DOC PREVIEW
UNT DSCI 3710 - Exam1Sp02a

This preview shows page 1-2 out of 7 pages.

Save
View full document
View full document
Premium Document
Do you want full access? Go Premium and unlock all 7 pages.
Access to all documents
Download any document
Ad free experience
View full document
Premium Document
Do you want full access? Go Premium and unlock all 7 pages.
Access to all documents
Download any document
Ad free experience
Premium Document
Do you want full access? Go Premium and unlock all 7 pages.
Access to all documents
Download any document
Ad free experience

Unformatted text preview:

A. - 1.83B. 1.35 *C. 0.17D. 1.05E. - 2.02A. p > .1B. .05 < p < .10 *C. .025 < p < .05D. .01 < p < .025E. p < .01A. 19.2B. 15.4 *C. 11.0D. 12.0E. 25.0A. 2.326B. 1.684C. 2.048*D. 2.423E. 1.645A. p > .1B. .05 < p < .10C. .025 < p < .05D. .01 < p < .025E. p < .01*A. p > .1B. .05 < p < .10C. .025 < p < .05 *D. .01 < p < .025E. p < .01COURSE: MSCI 3710 PRINT Name: Exam 1 Signature: Version A Student ID#: Spring 2002 Seat Number: Note: Whenever question(s) are connected you may be asked to assume a result (i.e., given a value as answer to a previous question); but this result (i.e., the given value) need not be the correct response for the previous question. This is done only to prevent you from losing points on a subsequent question because you made a mistake on one.Instructions: Please PRINT your name, student ID#, and seat number on this exam. Also, put your signature on this exam. Please PRINT your name, exam-version, and seat number on the Scantron.Also print your name on the backside of your Scantron. You have 75 minutes to complete this exam. The exam is open book, open notes, and open mind. You may use any type of calculator, but please show all your work on the exam and mark all answers on the scantron. Many of the questions follow the format of those in Adventures in Business Statistics. The remaining questions are either based on Excel outputs, or usean Adventures-like approach with problems similar to those assigned in the textbook. The chapter numbers given against in questions are only indicative, and you may need to integrate the concepts from other chapters. Do not detach this exam. When you have completed the exam, please insert the scantron into the exam booklet and return them both to your instructor. No cheating. Good luck and we wish you well on the exam.Use the paragraph below to answer the next six questions (Kvanli Chapter 8).The Caribbean boasts of inexpensive weddings. From past data, the average cost of a wedding is known to be $7500, with a standard deviation of $975. To test if the true mean costs have changed, a random sample of 36 current weddings is taken. Their average is $7750. Is there evidence that currently, the true mean cost of wedding differs from the usual $7500? Perform the test at  = 0.05.1. What are the null hypothesis and alternative hypothesis for this test?A. Ho:  = 7750 Ha:  7750B. Ho:   7750 Ha:  < 7750C. Ho:  = 7500 Ha:  7500 *D. Ho:  > 7500 Ha:  7500E. Ho:  = 7500 Ha:  <75002. The appropriate test statistic for testing the above hypothesis is:A. t because the sample size is smallB. t because the sample standard deviation was calculatedC. Z because the population standard deviation is known *D. Z because the sample variance was providedE. F because we do not know the equality of the variance3. What is the calculated value of the test statistic?A. - 0.45B. 1.54 *C. 1.96D. - 1.54 E. 1.6454. At 0.05 level of significance, where is the “Reject Ho” region?A. To the left of Z = - 2.33 and to the right of Z = 2.33 B. To the left of Z = -1.645 and to the right of Z = 1.645C. Between Z = -1.645 and Z = 1.645D. To the left of Z = -1.96 and to the right of Z = 1.96 *E. Between Z = -1.96 and Z = 1.965. Assuming the calculated value of the test statistic is 1.60, what are the decision and conclusion of the test?A. Fail to reject the null hypothesis, the mean cost of weddings is $7500. *B. Fail to reject the null hypothesis, the mean cost of weddings is not $7500.C. Reject the null hypothesis, the mean cost of weddings is not $7500.D. Reject the null hypothesis, the mean cost of weddings is $7500. E. Reject the null hypothesis, conclude no two weddings are equal to $7500.6. If the computed value of the test statistic is 1.96, what is the p-value?A. 0.10 B. 0.05* C. 0.025 D. 0.01 E. 0.005Use the information given in the following paragraph to answer the next four questions (Kvanli Chapter 8).The manager at the Sun and Sea Hotel believes the average expenditure per night for guests sharing the same room is greater than $200. The owner does not agree with this belief. A random sample of 20 such rooms was selected and the expenditure by the guests was recorded. The Excel results (at =0.1) are shown below:t Test for Population Mean Expend Number of Observations 20Sample Standard Deviation 35.226837Sample Mean 210.657500T* XXXXXP[T  T*]XXXXXT Critical, =0.11.32772890% CI for Pop. Mean 197.037201 to 224.2777997. What is the alternative hypothesis for this test?A. Ha:  > 210 B. Ha:  210 C. Ha:  < 200 D. Ha:  > 200 *E. Ha:  < 200 8. What is the calculated test statistic to test the manager’s belief?A. - 1.83B. 1.35 *C. 0.17D. 1.05E. - 2.029. Suppose the calculated test statistic is 1.40. Which one of the following would best describe the p-value of the test?A. p > .1 B. .05 < p < .10 * C. .025 < p < .05D. .01 < p < .025E. p < .0110. Suppose the p-value is 0.07. What is the conclusion of the test concerning the manager’s belief? A. The manager’s belief is supported. * B. The manager’s belief is not supported. C. The owner’s belief is supported. D. The manger and the owner, both are supported in the hotel.Use the information given in the paragraph below to answer the next four questions.(Kvanli Chapter 9)What’s in a name? Do companies with cyber, link or web (“tech”-words) in their name have a different growth rate than those who don’t? To test this idea, random samples of companies with or without these words in their names were selected and the rate of growth in their capitalization (as %) was recorded. The results are recorded below:Growth with “tech” words (1) Growth without “tech” words (2)x27.4 23.5s 4.4 3.3n 16 1411. Assuming the variance in the growth rate of the companies with the “tech” words is equal to that for the companies with out the “tech” words, what is the pooled variance?A. 19.2 B. 15.4 *C. 11.0D. 12.0E. 25.012. Assuming the variance in the growth rate of the companies with the “tech” words is equal to that for the companies with out the “tech” words, what is the critical value of the test statistic (absolute value) for testing whether the growth rates are any different? (Use  =


View Full Document

UNT DSCI 3710 - Exam1Sp02a

Documents in this Course
3650P1

3650P1

49 pages

Assgt_1

Assgt_1

8 pages

Assgt_3

Assgt_3

6 pages

DSCI 3710

DSCI 3710

13 pages

Assgt_4

Assgt_4

7 pages

SEP13

SEP13

2 pages

Assgt_1

Assgt_1

8 pages

Load more
Download Exam1Sp02a
Our administrator received your request to download this document. We will send you the file to your email shortly.
Loading Unlocking...
Login

Join to view Exam1Sp02a and access 3M+ class-specific study document.

or
We will never post anything without your permission.
Don't have an account?
Sign Up

Join to view Exam1Sp02a 2 2 and access 3M+ class-specific study document.

or

By creating an account you agree to our Privacy Policy and Terms Of Use

Already a member?