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The length of time sixth graders watch television each day is normally distributed with a mean = 118.3 minutes and standard deviation = 43.1 minutes. Use this information to answer the following:
(a) If 30 sixth graders are selected at random, find the probability that the mean amount of time spent watching television is between 120 and 150 minutes. Use the Central Limit theorem. (b) It is reported that 12% of sixth graders watch the TV show Laguana Beach. You randomly select 200 sixth graders and ask each if he or she watches Laguana Beach. What is the probability that 30 or more say yes? Use the Normal Approximation to the Binomial.
A simple random sample is found to be (0.7, 2.1). Can we conclude that 90% of households have between 0.7 and 2.1 children? Justify your answer.
lipitor is a cholesterol reducing drug. in clinical trials 94 subjects were treated with the drug and 200 were given a
suppose that a category of world class runners are known to run a marathon 26 miles in an average of 149 minutes with a
a certain brand of candies have a mean weight of 0.8608g and a standard deviation of 0.052 bsed on a sample of a
on a particular test iq scores for adults follow a bell-shaped symmetric distribution with mean100 and a variance of
Use the data to compute a point estimate for the population mean number of shares traded per day in 2010. Construct a 90% confidence interval for the population mean number of shares traded per day in 2010
An electronic circuit board fails randomly with failure rate of λ=0.00021 /h. When it fails it is replaced by a new board.
For this purpose, a random sample of 55 plots, each of size 100 square meters, is used. The number of ferromagnetic artifacts for each plot is determined.
A medical school claims that more than 32% of its students plan to go into general practice. It is found that among a random sample of 130 students, 46 of them plan to go into general practice.
Enlarged to 14 measurements, by including two additional measurements having a common value of 40 each. Find the standard deviation of the sample of 14 measurements.
Q) Construct two sets of numbers with at least five numbers in each set with following characteristics;
Generate a 95% confidence interval for the difference in mean systolic blood pressures between groups. Generate a 95% confidence interval for the difference in proportions of patients with hypertension between groups.
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