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# Untitled-3 - 9 An electrical contractor has observed that...

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Unformatted text preview: 9. An electrical contractor has observed that his accounts are paid on average in 65 days, with a standard deviation of 15 days. Using the empirical rule, estimate what proportion of the accounts will be paid after 95 days? a. 2.5% b. 0% c. 13.5% d. 16% e. 95% 10. The 90% conﬁdence interval for the population variance of the birth weight of a new born baby is [0.176, 0.209] ng. To test the claim that the population variance of the birth weight of a new born baby is not equal to .21 kg2 at a 15% level of signiﬁcance, what would be your conclusion? a. Do not reject the null hypothesis and conclude that there is insufﬁcient evidence to claim that the population variance of birth weight is not equal to .21 kg. \ b. Do not reject the null hypothesis and conclude that the population variance of birth weight is not equal to .21 ng. c. Reject the null hypothesis and conclude that there is insufﬁcient evidence to claim that the popu- lation variance of birth weight is not equal to .21 kg. d. Reject the null hypothesis and conclude that the population variance of birth weight is not equal to .21 kg. e. There is not enough information to make a conclusion. Use the following information to answer the next 4 questions (11—14): Suppose you are part of an NGO which is investigating the impact of hygiene and sanitary conditions on the spread of gastroenteritis in rural Africa. It is postulated that washing hands prior to cooking and intake of food, by more than half the population, reduces the spread of this disease. You draw a random sample from a village comprising of 80 persons, and ﬁnd that the proportion of people who maintain good hygiene habits is 40%. Is it safe to conclude that this village has reduced the spread of this disease? 11. What is the value of the test statistic to test your claim? a. -1.8257 b. 32.00% c. -0.1000 .. d._ —33.3333 i e. —1.7889 225 - ...
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