Entries by Munene david

In an analysis of the accuracy of weather​ forecasts, the actual high temperatures

April 28, 2020 in /by

In an analysis of the accuracy of weather​ forecasts, the actual high temperatures are compared to the high temperatures predicted one day earlier and the high temperatures predicted five days earlier. Listed below are the errors between the predicted temperatures and the actual high temperatures for consecutive days in a city. Do the standard deviations suggest […]

 

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Data table: 5 6 9 8 7 5 6 6 5 6 5 6 7 8 a. What is the mean family size for the sample ?

April 28, 2020 in /by

Data table: 5 6 9 8 7 5 6 6 5 6 5 6 7 8 a. What is the mean family size for the sample ? ________ (round off to the nearest tenth as needed) b. What is the standard deviation for the sample is _____________(round off to the nearest tenth as needed) c. […]

 

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Each car in a sample of seven cars was tested for nitrogen-oxide emissions

April 28, 2020 in /by

Each car in a sample of seven cars was tested for nitrogen-oxide emissions (in grams per mile). and the following results were obtained. 0.05, 0.12, 0.16, 0.17, 0.16, 0.06, 0.17 a. Assuming that this sample is representative of cars in use, construct a 95 % confidence interval estimate of the mean amount of nitrogen-oxide emissions […]

 

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Suppose certain coins have weights that are normally distributed

April 28, 2020 in /by

Suppose certain coins have weights that are normally distributed with a mean of 5.156 g and a standard deviation of 0.068 g. A vending machine is configured to accept those coins with weights between 5.026 g and 5.286 g. a. If 250 different coins are inserted into the vending machine, what is the expected number […]

 

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