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What are the main differences between descriptive and inferential statistics? Give examples of each.
When would random sampling not be the best approach to sample selection? Give an example.
Construct and interpret 90 percent on confidence interval for the mean. Be sure to interpret the meaning of this interval.
The simple coefficient of determination is the proportion of total variation explained by the regression line.
If you use a 0.10 level of significance in a two-tail hypothesis test, what is your decision rule for rejecting a null hypothesis that the population mean is 500 if you use the Z test?
One measure of the overall sampling error in the entire distribution of sample means is the
Gigi has rolled a natural on four straight tosses of the dice. This excites the gamblers standing around the table.
What is the probability that the mean price for a sample of 30 service stations is within $.03 of the population mean (to 4 decimals)?
if you sample 100 people and 20 turn out to be over 65 inches tall, you get $20. Which is better: a sample of size 100 or a sample of size 1,000? Choose one and explain. Does the law of averages relate to the answer you give?
Determine payback period for implementing Oracle Discoverer? Assume that WebFocus will be in-place until December 31 and the migration to Oracle will be done concurrently and is expected to be completed and operational by Dec 31 as well.
Binomial Distribution: Control Charts this problem will be referred to in the study of control charts. In the binomial probability distribution, let the number of trials be n = 3, and let the probability of success be p = 0.0228.
A random variable X is normally distributed with mu = 60 and standard XXX = 11. What is zscore for X = 71
Adele Weiss manages the campus flower shop. Flowers must be ordered three days in advance from her supplier in Mexico. Advance sales are so small that Weiss has no way to estimate the demand for the red roses.
Assuming that students make their decisions independently, the number who accept has the B (1200, 0.75) distribution. If this number is less than 950, the college will admit students from its waiting list.
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