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Pharmaceutical company. A pharmaceutical company is considering investing in a "new and improved" vitamin D supplement for children. 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 in England 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 re- cent study of 2700 children randomly selected from all parts of England found 20% of them deficient in vitamin D.
a) Find a 98% confidence interval for the proportion of children in England who are deficient in vitamin D.
b) Explain carefully what your interval means.
c) Explain what "98% confidence" means.
d) Does the study show that computer games are a likely cause of rickets? Explain.
What is the estimated standard error of the sample mean? Construct a 95 percent confidence interval for the population mean category fluency test score.
What is the probability that the person guessing the numbers guesses it incorrectly between 8 and 20 times out of the 34 times the game is played?
47% of students have children under 17 living at home with them. Find the probability that a random sample of 800 students will return more than 50% students with children under 17 living at home with them.
a way to make screening tests more economical is to pool samples. suppose that we would like to screen for a rare blood
one-way analysis of variance anova test.the following is a partial anova table.sourcesum of squaresdfmean
Discuss an element of drinking water where you see a public health gap or need that should be addressed. You may bring up a specific case relevant to your community if you have one, or bring up a global issue.
The null hypothesis is that the distribution of mother's educational level is the same for both treatment groups. The value of the chi-square statistic is 7.422. Evaluate the P-value
The manager accepts 90 bookings. What is the probability that more than 50 clients turn up?
Concrete blocks are to be used in the foundations of several buildings. The specifications state that the minimum arithmetic mean compressive strength of a sample of blocks must be 1,000 pounds per square inch (psi).
Calculate the mean, median, and standard deviation for ounces in the bottles and construct a 95% Confidence Interval for the ounces in the bottles.
determine the number of outcomes in the event. decide whether the event is a simple event or not. you randomly select
how many individuals will I need to sample if I want a 95% margin of error to be no more than 3%, I want to know if the results are significant at = 10%. With the information given.
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