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Deciding on the number of observations to include in a sample is an important decision when planning a reasearch study. What information is required to make this descision
Find the equation for the regression line for the data, and predict the final grade of a student who misses 3.5 days.
Determine mean and standard deviation for number of erroneous returns per batch.
Make up a scatter diagram with 10 dots for each of the following:
A federal report find that a lie detector test given to truthful persons have a probability of 0.2 of suggesting that the person is deceptive. A company asks 12 job applicants to take a lie detect test. Suppose that all 12 applicants answer truthfull..
The mean exam score was 545 with standard deviation of 49. Is the 45 point difference between the sample and the population merely due to chance?
A production process is known to produce a particular item in such a way that 5 percent of these are defective. If two items are randomly selected as they come off the production line
How many packages should be sampled in order to be 90% confident of being within 0.9% of the actual population percentage delivered damaged.
What is the mean of the sampling distribution of the (sample proportion) and what is the standard deviation of the and describe the sampling distribution of p
If you are dealt 3 cards from a shuffled deck of 52 cards, find the probability that all 3 cards are queens. A fair coin is tossed 8 times in succession. Find the probability of getting at least 4 heads.
Each student in an experiment was told to look at 100 cars and count the number of people wearing the seat belts. The mean score for the class was found to be 44, and standard deviation =7
At the 5% significance level, can the station conclude that the mean age of its listeners is not 25 yrs. Formulate and test the appropriate hypotheses. Use the critical value approach.
How many students would you include in a random sample to determine with 95% probability and to within 5% of the true value the proportion who arrive at 9am lectures without breakfast?
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