
Concept explainers
The verification of

Explanation of Solution
To find the required statistics using the Minitab, follow the below instructions:
Step 1: Go to the Minitab software.
Step 2: Go to Stat > Basic statistics > Display
Step 3: Select dataset ‘Field A’ and dataset ‘Field B’ in variables.
Step 4: Click on OK.
The obtained output is:
Statistics
Variable | N | N* | SE Mean | StDev | Minimum | Q1 | Q3 | Maximum | ||
Sample 1 | 7 | 0 | 4.86 | 1.20 | 3.18 | 1.00 | 2.00 | 4.00 | 8.00 | 10.00 |
Sample 2 | 8 | 0 | 6.50 | 1.02 | 2.88 | 3.00 | 4.00 | 6.00 | 9.75 | 10.00 |
From the above output we have find that the values of
(a)
(i)
The level of significance, null hypothesis and alternate hypothesis.
(a)
(i)

Answer to Problem 21P
Solution: The hypotheses are
Explanation of Solution
The level of significance is 0.05.Since, we want to conduct a test of the claim that population mean time lost due to hot tempers is different from the population mean time lost due to disputes arising from technical worker’s superior attitudes. Therefore the null hypothesis is
(ii)
To find: The sampling distribution that should be used along with assumptions and compute the value of the sample test statistic.
(ii)

Answer to Problem 21P
Solution: We can use student’s t distribution. The sample test statisticis
Explanation of Solution
Calculation:
Let’s assume that the lost time population distribution aremound shape and approximately symmetrical. The population standard deviation (
Using
The sample test statistic t is calculated as follows:
Thus the test statistic is
(iii)
To find: The P-value of the test statistic and sketch the sampling distribution showing the area corresponding to the P-value.
(iii)

Answer to Problem 21P
Solution: The P-value of the sample test statistic is 0.3384.
Explanation of Solution
Calculation:
The given hypothesis test is two tailed.
D.F = Smaller of
By using table 4 from Appendix
Graph:
To draw the required graphs using the Minitab, follow the below instructions:
Step 1: Go to the Minitab software.
Step 2: Go to Graph > Probability distribution plot > View probability.
Step 3: Select ‘t’ and enter D.f = 6.
Step 4: Click on the Shaded area > X value.
Step 5: Enter X-value as – 1.04 and select ‘Two tail’.
Step 6: Click on OK.
The obtained distribution graph is:
P-value = 2(0.1692)
P-value = 0.3384
(iv)
Whether we reject or fail to reject the null hypothesis and whether the data is statistically significant for a level of significance of 0.05.
(iv)

Answer to Problem 21P
Solution: The P-value
Explanation of Solution
The P-value (0.3384) is greaterthan the level of significance (
(v)
The interpretation for the conclusion.
(v)

Answer to Problem 21P
Solution: There is not enough evidence to conclude that population mean time lost due to hot tempers is different from the population mean time lost due to disputes arising from technical worker’s superior attitudes.
Explanation of Solution
The P-value (0.4043) is greaterthan the level of significance (
(b)
To find: The 95%confidence interval for
(b)

Answer to Problem 21P
Solution:
The 95% confidence interval for the difference of two means is
Explanation of Solution
Calculation:
The critical t-value for a two-tailed area of 0.05 is 2.447.
The difference of two means is
Now, the margin of error is computed as follows:
Now the confidence interval for the difference of two means;
The confidence interval for the difference of two means is
Interpretation:
At the 95% confidence level, we see that the difference of means
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Chapter 10 Solutions
Understanding Basic Statistics
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