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A researcher determines that 42.7% of all downtown office buildings have ventilation problems. Is this a statistic or a parameter; explain your answer.
At the .10 significance level you will test to determine if there has been an increase in selling time. Assuming we are using a t test what will be the critical value"?
Estimate with 90% confidence the difference in the level of satisfaction with service between the two branches.
What is the 25th percentile of a X² distribution with 20 degrees of freedom? What symbol is used to denote this value?
An insurance agent has appointments with four prospective clients tomorrow. From past experience the agent knows that the probability of making a sale on any appointment is 1 out of 5.
The weight of a product is normally distributed with a standard deviation of .5 ounces. What should the average weight be if the production manager wants no more than 5 percent of the products to weight more than 5.10 ounces.
As a way of fund raising, you decide to set up a hot dog stand, after a few weeks of doing this you sell 8 hot dogs every 10 minutes.
Hypothesis test for one population mean - What is the alternative hypothesis and What is the null hypothesis?
Assuming that the population standard deviations are the same, perform a two independent samples t-test on the hypotheses Null Hypothesis: μ1 = μ2, Alternative Hypothesis: μ1 ≠ μ2. What is the test statistic and p-value of this test?
If light bulbs have lives that are normally distributed with a mean of 2500 hours and a standard deviation of 500 hours, what percentage of light bulbs have a life less than 2500 hours?
Draw the suitable 2x2 table, compute and interpret suitable measure of association.
If one item is chosen at random, determine these probabilities. It is a TV
Let's work with a really idealized normal distribution. We'll pretend that American 12-year-old boys have an average (mean) weight of 100 lbs.
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