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Rickets. Vitamin D is essential for strong, healthy bones. Our bodies produce vitamin D naturally when sunlight falls upon the skin, or it can be taken as a dietary supplement. Although the bone disease rickets was largely eliminated in England during the 1950s, some people there are concerned that this generation of children is at increased risk because they are more likely to watch TV or play computer games than spend time outdoors. Recent research indicated that about 20% of British children are deficient in vitamin D. Suppose doctors test a group of elementary school children.
a) What's the probability that the first vitamin D deficient child is the 8th one tested?
b) What's the probability that the first 10 children tested are all okay?
c) How many kids do they expect to test before finding one who has this vitamin deficiency?
d) They will test 50 students at the third-grade level. Find the mean and standard deviation of the number who may be deficient in vitamin D.
e) If they test 320 children at this school, what's the probability that no more than 50 of them have the vitamin deficiency?
To impress the interviewer, many respondents in a survey of 400 persons exaggerated their annual incomes by anywhere from 2% to 50%. Does such exaggeration represent sampling error or nonsampling error? Explain.
The T84 calculator? Shaquille O'Neal is a professional basketball star who had a reputation for being a poor free throw shooter. As of this writing, he made 5155 of the 9762 free throw that he attempted,
1. investigating a particular stock you estimate the following returns and their associated probabilitiesprobability
A prof. can't decide how to vote on a tuition increase for the students at her univ. The incrase is supposed to pay for new student parking and there appears to be mixed feelings. The prof.
Suppose that 30 percent of the bottles produced in a certain plant are defective. If a bottle is defective, the probability is 0.9 that an inspector.
Obtain a block diagram of the control system. Design a control system to meet the following specifications: (1) closed-loop system bandwidth about 10 rad/s, and (2) percent overshoot less than 20% to a 10° step input.
If you use regular book as the reference category and another analyst uses, say, Kindle as the reference category, will you get the same regression results? Explain.
Using the least squares coded method, determine the equation for the straight line going through the earnings. Project, using the equation for the average hourly earnings for the year 1990
A specialty cleaning company charges an equipment fee and an hourly labor fee. A linear equation that expresses the total amount of the fee the company charges.
Calculate and interpret the effect size for this test and calculate and interpret any post-hoc test if necessary - Conduct all 6 steps of an independent-samples t test. Be sure to label all six steps
On average, which commodity is the most expensive?- Is a newspaper always more expensive than a ride on public transportation? Explain.
for a small sample difference of means test where n1 20 and n2 20 and we can assume the population variances are
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