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Question: Rickets. Vitamin D, whether ingested as a dietary supplement or produced naturally when sunlight falls on 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 recent 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.
b) Explain carefully what your interval means.
c) Explain what "98% confidence" means.
Phone calls arrive at the rate of 25 per hour at the reservation desk. Compute the probability of receiving four calls in a 5-minute interval of time.
What is the independent variable in this example?- What is the dependent variable?- As the value of the independent variable increases, what can we predict would happen to the value of the dependent variable?
The standard deviation of the sample was 6 people. Develop a 95 percent confidence interval for the population mean.
a) Construct a double stem-and-leaf diagram for these data. b) Find the sample mean, sample median, and sample standard deviation for these data.
Construct a 99% confidence interval for mu Subscript Upper XμX, the average time spent texting among all college students What is the value of the lower bound of the confidence interval? What is the value of the upper bound of the confidence interval..
Effective on 80% of women and 65% of men. it is known that 66% of the people who take drug are women. That is the probability that the drug is effective?
Imagine that you are trying to predict the price of gasoline (regular unleaded) and the price of natural gas for home heating during the next month.
Explain the differences between qualitative and judgmental statistical time-series, and explanatory/causal forecasting models.
suppose that you must establish regulations concerning the maximum number of people who can occupy an elevator. a study
some researchers in understanding g-loads on humans are interested in methods that can be used to assist pilots
a state lottery has1100 prizes of 1145 prizes of 1025 prizes of 655 prizes of 2902 prizes of 1290amp 1 prize of
Construct a 95% confidence interval for the average daily loss in this period. What decision should the potential partner make?
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