The data table contains waiting times of customers at a bank, where customers enter a single waiting line that feeds three teller windows. Test the claim that the standard deviation of waiting times is less than 2.12.1 minutes, which is the standard deviation of waiting times at the same bank when separate waiting lines are used at each teller window. Use a significance level of 0.050.05. Complete parts (a) through (d) below. LOADING... Click on the icon to view the data. 7.9 6.4 7.3 6.7 7.3 6.4 6.9 7.1 8.3 6.2 6.3 7.2 8.8 6.1 8.9 7.5 7.5 7.6 6.1 7.6 7.3 7.7 7.9 10.1 7.1 6.1 6.5 6.6 6.7 6.9 6.6 6.8 6.9 14.6 6.6 7.2 7.7 7.5 7.6 6.3 13.9 7.2 8.7 7.5 6.1 6.3 7.4 6.1 6.7 6.3 9.1 8.3 6.4 7.9 7.5 8.5 7.8 6.3 6.5 6.5 a. Identify the null and alternative hypotheses. Choose the correct answer below. A. Upper H 0 : sigma greater than or equals 2.1H0: σ≥2.1 minutes Upper H Subscript Upper A Baseline : sigma less than 2.1HA: σ<2.1 minutes B. Upper H 0 : sigma equals 2.1H0: σ=2.1 minutes Upper H Subscript Upper A Baseline : sigma not equals 2.1HA: σ≠2.1 minutes C. Upper H 0 : sigma equals 2.1H0: σ=2.1 minutes Upper H Subscript Upper A Baseline : sigma less than 2.1HA: σ<2.1 minutes Your answer is correct. D. Upper H 0 : sigma less than 2.1H0: σ<2.1 minutes Upper H Subscript Upper A Baseline : sigma equals 2.1HA: σ=2.1 minutes b. Compute the test statistic. chi squaredχ2equals=??? (Round to two decimal places as needed.)

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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The data table contains waiting times of customers at a bank, where customers enter a single waiting line that feeds three teller windows. Test the claim that the standard deviation of waiting times is less than

2.12.1

minutes, which is the standard deviation of waiting times at the same bank when separate waiting lines are used at each teller window. Use a significance level of

0.050.05.

Complete parts (a) through (d) below.

Click on the icon to view the data.

7.9

6.4

7.3

6.7

7.3

6.4

6.9

7.1

8.3

6.2

6.3

7.2

8.8

6.1

8.9

7.5

7.6

6.1

7.6

7.3

7.7

7.9

10.1

7.1

6.1

6.5

6.6

6.7

6.9

6.6

6.8

6.9

14.6

6.6

7.2

7.7

7.5

7.6

6.3

13.9

7.2

8.7

7.5

6.1

6.3

7.4

6.1

6.7

6.3

9.1

8.3

6.4

7.9

7.5

8.5

7.8

6.3

6.5

a. Identify the null and alternative hypotheses. Choose the correct answer below.

Upper H 0 : sigma greater than or equals 2.1H0: σ≥2.1

minutes

Upper H Subscript Upper A Baseline : sigma less than 2.1HA: σ<2.1

minutes

Upper H 0 : sigma equals 2.1H0: σ=2.1

minutes

Upper H Subscript Upper A Baseline : sigma not equals 2.1HA: σ≠2.1

minutes

Upper H 0 : sigma equals 2.1H0: σ=2.1

minutes

Upper H Subscript Upper A Baseline : sigma less than 2.1HA: σ<2.1

minutes

Your answer is correct.

Upper H 0 : sigma less than 2.1H0: σ<2.1

minutes

Upper H Subscript Upper A Baseline : sigma equals 2.1HA: σ=2.1

minutes

b. Compute the test statistic.

chi squaredχ2equals=???

(Round to two decimal places as needed.)

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