Question
Coronavirus or COVID-19 pandemic has shaken the world with its impact on human health and economies. To analyse whether the average number of new COVID-19
Coronavirus or COVID-19 pandemic has shaken the world with its impact on human health and economies. To analyse whether the average number of new COVID-19 cases in Pakistan and Turkey is the same, an analyst takes a sample of the number of new cases from 17-31 May 2020 with the following information.
Sample | Mean | SD |
Sample 1: Pakistan | 2046.467 | 507.655 |
Sample 2: Turkey | 1109.733 | 456.350 |
Using =0.05, the analyst performs the following hypotheses tests.
Note: For all the calculations, use 3 significant digits.
The F-test of equal population variances (homoskedasticity-equal spread)
a) Compute the following.
- Fobserved= Answer(Note: Use the largest value in the numerator)
- p-value = Answer
b) Based on the p-value of the test, the analyst's decision is: AnswerDo not reject the null of homoskedasticityReject the null of homoskedasticity
The test of equality of population means
- The null hypothesis, in this case, is H0: 1 Answer><= 2,
- The alternative hypothesis isH1: 1Answer#Wrong< 2 and the test is Answera two-sided testa lower-sided testan upper-sided test,
- The test statistic in this case is AnswertZJB because Answerpopulation variances are knownpopulation variances are unknown,
- The distribution of this test statistic under H0 is AnswerN(0,1)Student's t because Answerno df requiredthe df30the df <30,
- The observed value of the test statistic is Answer,
- Critical values are (Lower value, Upper Value) = (Answer, Answer),
- Decision:Since the observed value of the test statistic Answerfalls in the rejection region, therefore, there is enough statistical evidence to reject H0 of the equal average number of COVID-19 casesfalls in the non-rejection region, therefore, there is not enough statistical evidence to reject H0of the equal average number of COVID-19 cases.
The End
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