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A random sample of n = 4 scores is selected from a population with µ = 80 and σ = 20. On average, how much difference would you expect between the sample mean and the population mean?
Find a 90% confidence interval for the population mean salary of such personnel. What is the margin of error.
A market survey was conducted to estimate the proportion of homemakers who would recognize the brand name of a cleanser based on the shape and color of the container. Of the 1,4000 homemakers sampled, 420 were able to identify the brand by name.
Either summarize your design or give an appropriate layout with table.
It is better to use the median rather than the mean for a distribution when:
Calculate sample proportion and then also calculate a 99% confidence interval for true population proportion, p.
If 3 different factor levels show a lot of variation between levels this implies:
The ages of cars owned by all employees of a large company have a bell shaped distribution with a mean of 8 years and a standard deviation of 2 years. Using the empirical rule, find the approx. percentage of cars (owned by those employees) that are b..
A recent article in Business Week listed the "Best Small Companies." We are interested in the current results of the companies' sales and earnings.
If the company does not want to replace more than 5% of the televisions?
Find the 90% confidence interval for the variance and standard deviation for the time it takes a state police inspector to check a truck for safety if a sample of 27 trucks has a standard deviation of 6.8 minutes.
What is the probability that there will be more than three trucks either being loaded or waiting?
Pproportion who are sent to prison after pleading innocent and being found guilty? No, as the test value -1.96 is inside interval (-2.58, 2.58), No, as the test value -4.94 is outside interval (-1.96, 1.96).
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