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The weights of dormitory cockroaches follow a normal distribution. 14% of the dormitory cockroaches weigh below 77 grams and 10% of them weigh above 82 grams. Find the mean and standard deviation of their weights.
Testing equality of two means - difference in performance of the two gasolines and difference in gasoline mileage output
In a survey of women in a certain country (ages 20-29) the mean height was 64.5 inches with a standard deviation of 2.75 inches. What height represents the 90th percentile? What height represents the first quartile?
Perform a two-sample z-test for proportions to test if men are more likely than women to make online purchases of books.
Under what circumatances do you use a one-sided confidence interval instead of a 2 sided confidence interval?
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 ..
A large internet retailer, is studying the lead time (elapsed time between when an order is placed and when it is filled) for a sample of recent orders. The lead times are reported in days.
Findout the normal model for the given proportions. The professor has every student toss a coin 50 times also calculated the proportion
Explain the relationship between total gross and opening gross total gross and number of theatres total gross and week in top 60.
Explain clearly, in your own words, what is a Type I error in this context.
What is the best first glance prediction you can give the customer about the value of his house given your 2 variable linear regression analysis?
Select a random variable to represent the category. Produce a probability mass function for that variable, and use it to compute the mean, the median and the variance of the data in the data set. Show the probability mass function, both in tabular..
A group of teenagers were monitored closely over the period of several weeks to measure how frequently they watched violent television programs.
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