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a) Determine the proportion of instances that the duration was less than 240 seconds. Also express the proportion as a percent.
(hint: proportion is number of successes divided by total number.)
b) Calculate the 95% confidence interval of the proportion. What is the margin of error?
c) Calculate the 90% confidence interval of the proportion.
d) For a 95% confidence level and a margin of error of 3% (0.03), how many samples are needed?
A confidence interval increases in width as:
In you determine the GPA of 10 members of the class and then calculate the average, will the number you get necessarily be the same as the average GPA for the whole class? On what factors would you expect the reliability of the estimate to depend..
Let x be a random variable that represents a test score. What is the lowest score that would still place a student in the top 40% of the scores?
In order to test the assumption of a Poisson distribution, a random sample of 150 ten-minute intervals was taken.
She has a history of being successful at getting a donor on 55 percent of her calls. If June has a quota to get at least four donors each day.
Compute the standard error of estimate, and interpret its meaning.
What effect has the transformation had on the lowest exam mark and what effect has the transformation had on the highest exam mark - STATS 201/8 Data Analysis
Determine the probability that person's monthly gasoline (gallon) purchases will be less than 67 gallons.
On average, the size of the difference between the sample mean and the population mean is predicted by:
An experiment involves rolling a fair six-sided die repeatedly. How many times must the die be rolled for a {6} to result at least once with probability greater than or equal to 0.6 ?
Write introduction to SPC (STATISTICAL PROCESS CONTROL)? Describe the use of SPC tools used at D2D?
Name three elements of the inferential statistical analysis.
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