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Adreanna1018
17.05.2020 •
Mathematics
Consider the estimated equation from Example 4.3, which can be used to study the effects of skipping class on college GPA: 2 colGPA 1.39 .412 hsGPA .015 ACT .083 skipped (.33) (.094) (.011) (.026) n 141, R2 .234. (i) Using the standard normal approximation, find the 95% confidence interval for hsGPA. (ii) Can you reject the hypothesis H0: hsGPA .4 against the two-sided alternative at the 5% level
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Ответ:
Step-by-step explanation:
1) The confidence interval is calculated as the following
Hence, the confidence interval is![0.22776 \leq \beta_G_P_A \leq 0.59624)](/tpl/images/0653/7919/a9503.png)
11) Under two sid t-tailed test, the null hypothesis
Against the alternative hypothesis
Under null hypothesis
The degree of freedom is n - 1 = 140
From the t - table at 5% level of significance under two - tail is 1.96
Since , calculated value is lowe than the tabulated value, we do not reject the null hypothesis.
Ответ:
it’s 320cm^2
Step-by-step explanation: