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The New York Times reported that the mean time to download the homepage for the Internal Revenue Service is 0.08 seconds. Suppose that that download time is normally distributed with a standard deviation of 0.2 seconds. What is the probability that a download time is less than 1 second?
The mean weight of newborn infants at a community hospital is 6.6 pounds. A sample of seven infants is randomly selected
If in a random poll of 250 residents, 150 residents were in favor, how accurate is this result as an estimate of the proportion?
Does this sample provide enough evidence to conclude that self-esteem scores for these adolescents are significantly different from those of the general population? Use a two-tailed test with x =.01.
High precision titanium spheres are popular components in manufacturing of ball bearings. A factory has ordered a shipment of 5000 titanium spheres from aboard. It is found that the shipment has a mean radius of 1.5 cm with a standard deviation ..
How does hypothesis testing contribute to the scientific knowledge base? What is one example of a null hypothesis statement?
Toss ten unbiased coins once at the same time, what is the probability that seven heads showing up? Use Binomial Distribution to calculate the probability.
Random sample of 100 people yielded following data on number of tissues utilized in a cold: x-bar = 38, s = 20. By using sample information provided, compute the value of test statistic for the relevant hypothesis test.
A manufacturer wants to increase the absorption capacity of a sponge. Based on past data, the average sponge could absorb 3.5 ounces.
The frequency distribution below was constructed from data collected from a group of 25 students. Construct a relative frequency distribution.
For following scores determine values of each expression: X: 4, 2, 1, & 5. åX, åX 2 , (åX) 2 , å(X-1).
Determine what analysis would you do on each problem (ie, one-sample z-test, one-sample t-test, proportion test, two-sample independent t-test, or paired test)?
The average hourly wage of employees of a certain company is $9.83. Assume the variable is normally distributed.
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