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Is math the key to success in college? A College Board study of 15,941 high school graduates found a strong correlation between how much math minority students took in high school and their later success in college. News articles quoted the head of the College Board as saying that "math is the gatekeeper for success in college."5 Maybe so, but we should also think about lurking variables. What might lead minority students to take more or fewer high school math courses? Would these same factors influence success in college?
A company is interested in estimating the mean number of days of sick leave taken by its employees. The firm's statistician randomly selects 100 personnel files and notes the number of sick days taken by each employee.
Inverse probability based on normal distribution - The data set has a bell-shaped distribution. Between what two prices do 68% of the houses lie?
determine the sample size needed to reject ho if the ratio is 3 times the hypothesized value of 2 variances alpha 0.05
Calculate the mean, median, mode, variance, standard deviation and skewness. Construct the 95% confidence interval.
Find the probability that a random sample of size 54, selected with replacement, will yield a sample mean greater than 4.1 but less than 4.4. Assume the means to be measured to the nearest tenth.
Employee I has a higher productivity rating than employee II, and a measure of the total productivity of the pair of employees is
In this the anniversary of the sinking of the Titanic, it is interesting to look at the distribution of those who survived, and those who died. The table below describes the number of men, women and children who were passengers on the Titanic.
use the weights of cans of generic soda as sample one and use weights of cans as the diet version of that soda as
Consider the following results for two samples randomly taken from two populations. Construct a 99 percent confidence interval estimate of the difference between the two sample means.
Can you conclude that engineers follow an accident profile that is different from the rest of the drivers in the region?
a sample of 66 women over the age of 50 used the new cream for 6 months. of those 66 women 30 of them reported skin
the number of chocolate chips in an 18-ounce bag of chocolate chip cookies is normally distributed with a mean of 1238
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