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A chain of launderettes is investigating the lifetime of the washing machines that they use, measured in the number of washes completed before they need repairing. There are a number of machines used throughout their branches that have been installed at different times with each one having the number of completed washes recorded. To sample the lifetime of the washing machines the most recent 125 machines that have failed had their lifetimes recorded. This sample had a mean lifetime of 3124 hours and a variance of 2017.
a) Calculate a 95% confidence interval for the average lifetime of the washing machines that the company uses.
b) Calculate the sample size required to reduce the margin of error for a 95% confidence interval down to 7 (i.e. E = 7).
Please do not use excel functions. I would like to see clear workings and commentary for calculations.
Give an example of a problem (business, political, scientific) in which ANOVA analysis would be appropriate. (Hint: the dependent variable is categorical, such as male vs. female or comparing three different types of fertilizer.)
Compute the relative frequencies and percentages for all classes. Draw a histogram and a polygon for the relative frequency distribution.
A Statistic professsor plans classes so carefully that the lenths of her classes are uniformly distributed between 46.0 and 56.0 minutes. Find the probability that a given class runs less than 51.5 minutes. Find the probability of selecting a clas..
What are the pros and cons of selecting an established theoretical or conceptual model or framework? What are the pros and cons of creating/developing your own?
Find the percentage of buyers who said their price range is between $150,000 and $153,300.
Calculate the probability that a hand of 13 cards dealt from a normal pack of 52 contains exactly two kings and one ace. what is the probability that it contains exactly one ace given that it contains exactly two kings.
For the first test, assume the data are from an independent-measures study using two separate samples.
Complete the test at the 5% level of significance.
The weights (in pounds) of a sample of five boxes being sent by UPS are: 12, 6, 7, 3, & 10.
The owner of a restaurant serving Continental-style entrees has the business objective of learning more about patterns of patron demand for the Friday to Sunday weekend time period.
Problem based on decision tree - Evaluate the strategy that maximizes the manufacturer's expected net earnings.
The following table shows the hardness (in Brinell hardness numbers) and the tensile strength (in thousands of pounds per square inch) of ten specimens of a certain alloy.
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