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a. Determine the standard error of estimate.
b. Suppose a large sample is selected (instead of just 10). About 95 percent of the predictions regarding sales would occur between what two values?
Number of Sales Number of Sales Contacts, ($ thousands), Contacts, ($ thousands), X Y X Y 14 24 23 30 12 14 48 90 20 28 50 85 16 30 55 120 46 80 50 110
Compute a 95% confidence interval for the mean saline of the tears. You select a random sample of 100 tear drops. The sample has an average salt concentration of 0.1 with a standard deviation of 0.01.
At the .05 significance level can we conclude that there is more variation in the processing time of the new machine?
The ACT is also distributed with meanof 21 and standard deviation of 4.7. Rachel wants to be in the 98th percentile on each test. What scores must she recieve on each exam?
For a normal random variable X with mean 70 and standard deviation 10. Calculate the probability that 60 80}.
In order to determine whether or not a driver's education course improves the scores on a driving exam, a sample of six students were given the exam before and after taking the course. The results are shown below:
Cans of Paint Purchased During a recent paint sale at Corner Hardware, the number of cans of paint purchased was distributed as shown. Find the mean, variance, and standard deviation of the distribution.
An election poll reported that a candidate had an approval rating of 49% with a margin of error E of 2%. Construct a confidence interval for the proportion of adults who approve of the candidate.
The container label. What is the probability that a bottle of this liquid detergent will fail to meet the quality control standard?
Suppose a random sample of size 64 is drawn from a population with a mean of 277. If 90% of the time the sample mean is less than 280, what is the population standard deviation?
It is suspected that the mean turnover has changed and is not 6.0. Use the .05 significance level. Give the formula for the test statistic.
Construct a 90% confidence interval for the population proportion, p, in order to test the claim from a confidence interval point of view. What is the best point estimate for p?
What proportion for smoking teenagers think their peers care a lot about keeping their weight down?
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