For 1915 the answer is A and the explanation says we find th

For 19.15 the answer is A and the explanation says;

we find that there was no significant difference in mean Self-Concept Scale scores for men and women t=-0.8276, df=62.8, P=0.4110.

I don\'t understand why it is no significance.

Please explain details about this answer.

2.

In this question, I don\'t get it.

especially (b) , the anwer is yes. but i don\'t understand

please explain details about this problem.

thanks

tublniehd the simpler, conservative Option 2 for inference without software. With software, the more accurate Option 1 procedures are painless. APPLY YOUR KNOWLEDGE 19.13 Stucients\' self-concept. A study of the self-concept of seventh-grade students asked if male and female students differ in mean score on the Piers-Harris Children\'s Self-Concept Scale.1 Software that uses Option 1 gives these summary results: Gender n Mean Std dev Std err df 31 55.5161 12.6961 2.2803 -0.8276 62.8 0.4110 47 57.9149 12.2649 1.7890 Starting from the sample means and standard deviations, verify each of these entries: the standard errors of the means; the degrees of freedom for two-sample t; the value of t tandard errors of the means; the degrees of freedom for two-sample t 19.14 Perception of life expectancy. Figure 19.5 (page 477) gives output for the life expectancy data in Exercise 19.8 from software that does Option 1 with the correct degrees of freedom. What are x and s, for the two samples? Starting from these values, find the t test statistic and its degrees of freedom. Your work should agree with Figure 19.5 19.15 Students\' self-concept, continued. Write a sentence or two summarizing the comparison of female and male students in Exercise 19.13, as if you were preparing a report for publication. Use the output in Exercise 19.13.

Solution

The p-value for this test is 0.4110 and is not below 0.05 (common significance level). Thus this test is not significant, and we conclude that the mean difference between male and female on given scale is not significantly different from zero, or in other words on given scale, males and females mean do not differ significantly.