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1) Vitamin D is an essential ingredient for maintaining strong bones and teeth. Sources of this vitamin are natural sunlight and certain dietary supplements. There is a growing concern among pediatricians that today's youngsters are spending too much time indoors. This increases the risk of vitamin D deficiency and all of its related health issues. A research team would like to estimate the proportion of children (aged 6 to 12) that currently exhibit a deficiency in this micro-nutrient. For their purposes a 90% CI must be no wider than 15.5% to be useful. Given these constraints, the number of children required for the sample is:
2) The ability to taste the compound phenylthiocarbamide (PTC) is a genetically controlled trait in humans. Researchers are planning a study to estimate the proportion of these "tasters." For their purposes a 95% CI must be no wider than 22% to be useful. Given these constraints, the number of people required for the sample is:
If there are 12 business-class passengers and 50 tourist-class passengers on a particular flight, what are the expected value of total luggage weight and the standard deviation of the total luggage weight?
question the selling prices in thousands of dollars for a sample of 15 recreational vehicles sold by getaway rvs and
a farmer loses 60000 when the summer is too dry and makes 100000 when the growing season is moderate. the probability
Suppose that a study based on a sample from a targeted population shows that people at a pizza restaurant are hungrier than people at a coffee shop. Make an interference based on the results of the study.
Calculate Cohen's d measure effect size for both tests (σ = 20 and σ = 10). Explain how sample size affect outcome of hypothesis test. How does sample size affect measures of effect size?
A representative of the Environmental Protection Agency (EPA) wants to select samples from 10 landfills. The director has 15 landfills from which she can collect samples. How many different samples are possible?
there are a total of 160 practicing physician in a city. of them 75 are female and 25 are pediatricians of the 75
Compute the probability of seven consecutive points falling above the centerline given a stable process. Is this probability associated with type I or type II error?
Discuss the properties of a normal distribution. Why are there infinite possible normal distributions? Why should one assume that sample data represents a population distribution?
two different analytical tests can be used to determine the impurity level in steel alloys. six specimens are used and
when a population mean is compared to to the mean of all possible sample means of size 25 the two means area. equalb.
How much better are the workers at one plant compared to another? How much "better" is line 1 of variety A compared to line 2 of variety C?
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