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Coffee manufacturers are interested in whether the mean daily consumption of regular coffee drinkers is less than that of decaffeinated-coffee drinkers. A random sample of 50 regular-coffee drinkers showed a mean of 4.35 cups per day, with a standard deviation of 1.20 cups per day. A sample of 40 decaffeinated-coffee drinkers showed a mean of 5.84 cups per day, with a standard deviation of 1.36 cups per day. Use the .01 significance level. Compute the p-value.
For following scores determine values of each expression: X: 4, 2, 1, & 5. åX, åX 2 , (åX) 2 , å(X-1).
The Minitab output for the Tukey Least Significant Difference multiple comparisons is below. Which means are different and similar
Sampling variability refers to the idea that different samples will include different individuals
36 values given here are based on summary statistics from research by cumming. Do you think that these data are normally distributed?
Mean threshold values and standard deviations for the three groups are given below. Normal probability plots showed the three populations were well approximated by the Normal distribution.
For thefts involving more than $1,000, there is an inverse relationship between the value of the goods stolen and the length of the prison sentence given to the thief.
Explain in words general pattern of correlation is statistically important.
In certain normal distribution of scores, mean is 50 and standard deviation is 4. Determine z-score corresponding to a score of 55.
Compute the probability that debt for a randomly selected borrower with good credit is more than $18,000?
The number of degrees of freedom corresponding to between treatments is:
The estimated salary range is $4,500, the margin of error should be $100 and the desired level of confidence is 95%.
What percentage of the averages or medians of the sample will be greater than 140 seconds?
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