Question

Vitamin​ D, whether ingested as a dietary supplement or produced naturally when sunlight falls upon the​ skin, is essential for​ strong, healthy bones. The bone disease rickets was largely eliminated during the​ 1950s, but now there is concern that a generation of children more likely to watch TV or play computer games than spend time outdoors is at increased risk. A recent study of

28002800

children randomly selected found

1919​%

of them deficient in vitamin D. Complete parts a through d.

​a) Construct a​ 98% confidence interval for the true percentage of children who are deficient in vitamin D. Select the correct choice below​ and, if​ necessary, fill in the answer boxes within your choice.

A.The​ 98% confidence interval is

left parenthesis nothing % comma nothing % right parenthesis%,%.

​(Round to one decimal place as​ needed.)

B.

The conditions of a confidence interval are not satisfied.

​b) Does the study show that computer games are a likely cause of​ rickets?

A.

​No, because the interval says nothing about causation.

B.

Yes. Since food manufacturers have increased the amount of vitamin D in their products over the​ years, it is likely the case that children playing too many computer games has caused the increase in rickets.

C.​Yes, because the bone disease was largely​ eliminated, and now we are​ 98% confident that

1919​%

of children have the

deficiency.

D.

​No, because the study suggests that it is more likely the case that a change in​ children's diets over the years is the cause for the increase in rickets.

Answer 1

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QEFC-1 -1- 98.1 10.98 -0.00 Whato.collo f. 20.01 212= 200.01) hull= 8. 92.63] From & , we get 98.1. of C1=C649]+ C2-8263)*/0. La xCl-o.L9) V 9800 = to:La] [9.6263x D Lako. BIJ VOBOD E to. La) + [2.3263 * 0-1539 2800 = Co.la] - [ 8.8263 * 15.4966x10-5 - to.[9]+ [2.8263 * 0.007413) - Co.LQJE L0.01924) - to 1 - 0 . 01/ 240, Co. La+ 0-01-20] e Co.1721 ,0.9073) eto. 113, 0.090-) There option fore, is correct onower. left parenthesis 10.113), 0. 2017 wane 93.1. Confidence inkrval is

6 Doels the study show that computer? the computer gernes are likely hk hale to show that Cause of ricketts, - i deres Nou because the intercal Says nothing about Therefore, option of Correct answer.