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Data to test the difference between two weighing methods for wheat deliveries gave a mean difference of 10 kg with a sample standard deviation of the difference of 20 kg, from a sample of size 50. What is the value of the test statistic? Give your answer to two decimal places.
The following data set shows the ages of the first 7 presidents and the 7 most recent presidents including President Obama. Find the mean, median, and range for each of the two data sets.
In an experiment in which a die was rolled 188 times it was counted up how many times each face came up. The results are as follows:
q1 in about 250 words describe how linear regression analysis could be used in your organisation or any organisation
construct a 95 confidence interval to estimate the population proportion with a sample proportion equal to 0.60 and a
Thirty percent of the population in a southwestern community are Spanish-speaking Americans. A Spanish-speaking person is accused of killing a non-Spanish speaking American.
Find the confidence interval for the population proportion.
Perfam is a manufacturer of fragrances for women. It currently sells two brands, one called Allure, which is sold to wholesalers for $40, and another called Beauty, which is sold to wholesalers for $20. It is considering adding a mid-priced brand c..
compare the mean for the heights of males which is 69.78 and the mean for the heights of females which is 67.08.
Consumer Review posts reviews and ratings of a variety of products on internet. The following is a sample of 20 speaker systems and their ratings (www.audioreviews.com).
Describe when a z-test should be performed as opposed to a t-test? Which (if any) can we use all the time? Why or why not?
For the sheet-metal stamping machine in certain factory, the time between failures, X1 has a mean between the failures, of 56 hours and a variance of 16 hours.
at a certain gas station 70 of the customers use regular-grade unleaded gas and 30 use higher-grade unleaded gas. it is
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