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A sample of 23 European countries found that the variance of life expectancy was 7.3 years. What is the 95% confidence interval for the variance of life expectancy in Europe.
a. 4.7 < o2 < 13b. 27.2 < o2 < 118.3c. 28.9 < o2 < 115.0d. 5.6 < o2 < 10.3
o 2 is to the 2nd power
A large tank of fish from a hatchery is being delivered to a lake. The hatchery claims that the mean length of fish in the tank is 15 inches, and the standard deviation is 2 inches. A random sample of 36 fish is taken from the tank.
You took the standard deviation of 4.5 minutes from a commuting friend and believe that that is the standard deviation for the area. Prepare a 95% confidence interval for the true average commuting time.
Suppose the salary of assembly line workers has Normal distribution with mean of $20,000, and standard deviation of $3,000.
Chi-square test for independent attributes - Are the opinions on the tax cut proposal independent of party affiliation? Use a = 0.01
A random sample of 400 college students was selected and 120 of them had at least one motor vehicle accident in the previous two years.
Based on a scatter diagram, would you estimate the linear correlation coefficient to be:
A researcher is interested in the relationship between caffeine consumption and activity level for elementary school children. A sample of 20 children is obtained and the children are separated into two roughly equivalent groups.
Using standard normal table, show critical value for left-tailed test with α = 0.02.
Once production is set up, 80 units can be produced per day. Daily demand rate for the units is 60 per day. a. What is the most economical number to produce per production run? b. How long is each production cycle?
Find a 90% confidence interval for the mean decibel level µ for this type of transit vehicle.
Find the probability that the driver was intoxicated or the pedestrian was not intoxicated?
The probability that a new advertising campaign will increase sales is assessed as being 0.60. The probability that the cost of developing the new ad campaign can be kept within the original budget allocation is 0.50.
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