Mean, median, mode, range, and outliers
Find the mean of the following set of data: 13, 23, 21, 20, 21, 24, 18
What is the mean is 20
Thirty randomly selected students took the calculus final. If the sample mean was 92 and the standard deviation was 9.4, this is the MARGIN OF ERROR for a 95 percent confidence interval for the mean score of all students from which the sample was gathered.
What is 3.36?
Thirty randomly selected students took the calculus final. If the sample mean was 92 and the standard deviation was 9.4, construct a 99 percent confidence interval for the mean score of all students from which the sample was gathered.
What is (87.27, 96.27)?
A random sample of 50 students' test scores yielded a mean of 78 with a known population standard deviation of 10. Construct a 95% confidence interval for the population mean test score.
(75.24,80.76)
The 90% interval for the statistics test has a point estimate of 72% and a margin of error of 7%. What is the lower bound for the interval?
What is 65%?
What is the mode: 10, 9, 4, 4, 8, 8, 8, 4, 7, 6, 11, 14, 27
What is 4 and 8
The Critical Value for a 99% confidence interval.
What is 2.576?
3. Which of the following does NOT have an affect on the width of a confidence interval?
a) Sample standard deviation
b) t*
c) Sample mean
d) Sample size
What is Sample Size?
Given:
This is the Confidence Interval.
What is (171.71,178.29)
Complete the equation: point estimate +/- _____
What is margin of error?
Find a possible missing value in the set of data if the range is 20. 14, 8, 17, 21, ____, 11, 3, 13
What is 1 or 23
zc * sigma/sqrt(n)
What is the margin of error?
In a crash test of 15 troopers, collision repair costs are found to have a distribution that is approximately normal, with a mean of $1800 and a standard deviation of $950. Construct a 99% confidence interval for the repair cost for the population.
What is (1070, 2530)?
A company is studying the average commute time for its employees. A sample of 40 employees showed an average commute time of 35 minutes. Assume the population standard deviation is known to be 8 minutes. Construct a 99% confidence interval for the mean commute time.
What is between 31.75 and 38.25 minutes
Increasing the sample size __________ the confidence interval.
What is decrease?
Frank has 3 nickels, 5 dimes, and 2 quarters. Find the mean, median, mode and range of the values of Frank's coins.
What is: mean: 11.5 cents median: 10 cents mode: 10 cents range: 20 cents
Given the interval (21, 45), this is the margin of error.
What is 12?
If the 95% Confidence Interval for a population mean is (114.56, 125.54), then is it likely that the true population mean µ is greater than 130?
What is no?
A factory tests the lifespan of a batch of light bulbs. A random sample of 60 bulbs has a mean lifespan of 1,200 hours, with a known population standard deviation of 100 hours. Determine the 95% confidence interval for the true mean lifespan of all light bulbs from this batch.
What is (1174.69,1225.31)
A recent study of 750 Internet users in Europe found that 35% of Internet users were women. What is the 95% confidence interval of the true proportion of women in Europe who use the Internet?
What is (.316, .384)?
What is the definition of the term mode?
What is the value or values that occur the most often in a set of data.
Find the margin of error for a sample mean of 600, sigma=50, n=25 at 95% confidence.
What is (580.4,619.6)?
A 90% confidence interval for the mean speed driven by cars on Due West Road is given by (21, 45). What was the sample mean of this study?
What is 12?
A company surveys 200 customers and finds an average satisfaction score of 4.2 out of 5, with a known population standard deviation of 0.5. Construct a 98% confidence interval for the true mean customer satisfaction score.
What is (4.12,4.28)
Which of the following values below represents the critical value for a 98% confidence interval?
What is 2.326?