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Finding the probability of each event in a group of events of different possibility
The table below shows the number of students at a small liberal arts college.
Freshmen
Sophomores
Juniors
Seniors
totals
Male
342
296
192
1074
Female
368
314
220
1164
Total
710
506
412
2238
If one student is randomly selected from this college, find the probability of selecting:
a. A freshman if the student is female.
b. A female if the student is a senior.
c. A sophomore male.
Construct a 95% confidence interval for the proportion of all those who experience some type of discomfort.
Explain why we need to use the t distribution. What assumption do you need to make?
An experiment was carried out to assess the effects of four tomato varieties and four planting densities on yield. There were 64 plots, and each of the 16 factor combinations was randomly assigned to 4 plots.
Suppose the sample variance for 30 parts turns out to be s 2 = .0005. Use α = .05 to test whether the population variance specification is being violated.
Create a 90% confidence interval for proportion of all kernels that would not pop.
Compute a 95% confidence interval for the population proportion of positive drug tests. Explain why is the normality assumption not a problem despite the very small value of p.
Change the frequencies to percentages - is there a group more likely to get high salaries.
Constructing histogram, Using a normal probability plot, Plotting residuals versus x values.
What percentage of population scored between the mean and Jorge?
The New York Times reported (L.J> Flynn, Tax Surfing, The New York Times, March 25, 2002, p. C10) that the mean time to download the home page for the internal Revenue Service (IRS) , was 0.8 second. Suppose that the download time was normally di..
Find out coefficient of correlation between variables. Interpret the value.
To find the 95 percent confidence interval for the true population mean. From the results below, is it true that 95% of the sample means will fall
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