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Recent recommendations suggest 60 minutes of physical activity per day. A sample of 50 adults in a study of cardiovascular risk factors report exercising a mean of 38 minutes per day with a standard deviation of 19 minutes. Based on the sample data, is the physical activity significantly less than recommended? Run the appropriate test at a 5% level of significance.
using the data shown below suppose we focus on the proportions of patients who show improvement. is there a
N = 500 is to be selected from the population. What is the probability that the sample proportion, will be within ± 3 percentage points of the true p, i.e., Pr{0.42 ≤ ≤ 0.48}?
In calculating the UCR rape rates in New York City, which of the following would appear to be the best data for the denominator?
lets say a publisher makes one typo per 1000 pages. without using the formula or calculating any numerical answers
A sample of 20 pages was taken without replacement from the 1,591-page phone directory Ameritech Pages Plus Yellow Pages. On each page, the mean area devoted to display ads was measured
question suppose you have an investment a whose return is normally distributed with mean 8 and standard deviation of
we know that the average life of a light bulb is 10000 hours.there are 12 lightbulbs in a classroom. in order for a
What is the probability the Time/CNN poll will provide a sample proportion within plus-or-minus 0.02 of the population proportion?
Use the information given to calculate the standard error of the mean. Mean systolic blood pressure for a sample of n=324 men is =123.5, and the standard deviation is s=9.
a confidence interval is desired for the true average stray-load loss u watts for a certain type of induction motor
The width of a confidence interval will be:
Costs of Television: Listed below are prices (in dollars) and quality rating scores of rear-projection televisions. All of the televisions have screen sizes of 55 or 56 inches.
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