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Q1. Calculate each of the following values for the data set below (assume it is a population).
{3.42, 4.10, 4.15, 4.19, 4.26, 4.85, 5.01, 6.22}
a. Variance
b. Standard deviation
c. Skewness
Q2. Repeat parts a and b of the first exercise under the assumption that the data set is a sample.
A system is tested for 10,000 hours and experiences 2 failures. Its failure rate is believed to be Poisson distributed.
Construct frequency distribution tables for both the exports and imports data. Plot the frequency distributions on to one graph. Comment on your graphs.
The book has a program on page 153 for this, but the program was written is an unusual way. The subject should be mouse. So how should we dene mouse in the data?
Now he wants to know if there is a difference between the three formats. Is there?
Construct the confidence interval to find the estimated margin of error. Then find the sample mean - A biologist reports a confidence interval of (3.3,4.5) when estimating the mean height (in centimeters) of a sample of seedlings.
Normalized matrix for one decision criterion at Firm T is given below.
A dataset has 1000 records and 50 variables with 5% of the values missing, spread randomly throughout the records and variables. An analysis decides to remove records that have missing values. About how many records would you expect would be remov..
Calculate a regression that examines whether or not you can predict if a student wants a lecturer to be extroverted using the student's extroversion score.
Using the sample information given in the above exercise, the p value for testing Ho versus Ha can be calculated to be 0.0057
A food snack manufacturer samples 7 bags of pretzels off the assembly line and weighs their contents. If the sample mean is 12.7 oz. and the sample standard deviation is 0.40 oz., find the 95% confidence interval of the true mean.
Is there solid evidence that the earth is getting warming? 69% of 731 male resondents answered yes and 70% of 770 female respondents answered yes.
The diameters of a wooden dowel produced by a new machine are normally distributed with a mean of 0.55 inches and a standard deviation of 0.01 inches. What percent of the dowels will have a diameter less than 0.57?
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