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A population has a mean of 79 and a standard deviation of 27. Sample means are computed for several thousand random samples of size ? = 81, and a relative frequency histogram is constructed for the sample means.
1. What type of shape would you expect the histogram of the sample size to have?
2. What value would you estimate for the mean of the histogram of sample means?
3. What value would you estimate for the standard deviation of the histogram of sample means?
A random sample of 1440 current job applicants results in 61 failures (based loosely on data from the American Management Association).
In an experiment in which a die was rolled 188 times it was counted up how many times each face came up. The results are as follows:
You are planning to test a vaccine for a virus that has no vaccine. Since the disease is usually not serious, you will expose 100 volunteers to the virus. After some time, you will record whether or not each volunteer has been infected.
Enter the data and use the appropriate commands to find the mean, median, mode, sample standard deviation, population standard deviation, 10% trimmed mean, and data count.
Can we conclude that car size is dependent on marital status? YES or NO (circle one)
The grade point averages for 10 randomly selected high school students are listed below. Assume the grade point averages are normally distributed.
What is the probability of finding 1 or more children with chronic bronchitis in a population where the incidence rate of chronic bronchitis is 10% (like the one above?)
Make for more scatter plots comparing GDP growth 1970-2000 to corruption, political rights, rule of law, and socio-political instability
At a 5% level of significance, is there evidence to conclude that the mean life is different from 375 hours?
What value is standard deviation for this data? What type of probability is this?
Determine the dependent variable(s)? Determine the value of the statistic? Write down the name of one variable not mentioned in this study that one might wish to control for.
By using 0.05 level of significance, is there any evidence of difference in mean life of bulbs produced by two kinds of machines?Calculate p-value and interpret its meaning.
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