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bettyrose69
17.06.2020 •
Mathematics
For an aptitude test for quality-control technicians in an electronics firm, history shows scores to be normally distributed with a variance of 2500. For 20 applications who took the test, the sample standard deviation was 68. Is there enough evidence to reject the assumption that the variance of scores is 2500. Use significance level of 0.05.
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Ответ:
The degrees of freedom are given by:
And the p value would be given by:
Since the p value is lower than the significance level we have enough evidence to reject the null hypothesis and we can conclude that the true variance for this case is different from 2500
Step-by-step explanation:
Information given
Null and alternative hypothesis
We want to test if the true variance is 2500, so the system of hypothesis would be:
Null Hypothesis:![\sigma^2 = 2500](/tpl/images/0687/9108/31855.png)
Alternative hypothesis:![\sigma^2 \neq 2500](/tpl/images/0687/9108/cb852.png)
Calculate the statistic
The statistic would be given by:
Repalcing we got:
The degrees of freedom are given by:
And the p value would be given by:
Since the p value is lower than the significance level we have enough evidence to reject the null hypothesis and we can conclude that the true variance for this case is different from 2500
Ответ:
Shawty bad with a Skechers on
Wanna hold your hand, make you my girl
Light up, light up, Skechers
Light up, light up, my world
Shawty bad with a Skechers on
Wanna hold your hand, make you my girl
Light up, light up, Skechers
Light up, light up, my world
Step-by-step explanation: