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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.
A major benefit of two-way ANOVA over several one-way ANOVAs, If an F test for interaction is significant.
Recent crime reports indicate that 5.2 motor vehicle thefts occur each minute in the United States. Assume that the distribution of thefts per minute can be approximated by the Poisson probability distribution.
A. Determine the regression equation. B. Determine the estimated sales if 40 contacts are made.
Albert Einstein stated, "The formulation of a problem is far more often essential than its solution, which may be merely a matter of mathematical or experimental skill.
The Absent Minded Professor study was a RCT, which had an objective to estimate the protective effect of drug "No-Reminder" compared to drug "Reminder" on risk of "Forgetful syndrome". The study found that the drug "No-Reminder" was protective.
Demonstrate your understanding of choosing the type of regression model to the given data, by explaning three factors that should be taken into account in the choice between different models.
The management of White companies considering a new method of assembling its golf cart. Compute which assembly time using the new method is faster.
Otherwise, no ordering will take place. Find the steady-state probabilities of the state of this Markov chain?
The following frequency table lists the sales of an item and the number of times it has occurred. It was obtained from historical records. Sales/Frequency: 10/100, 15/120, 20/300, 25/350, 30/400, 35/500, 40/300, 45/170.
Results were analyzed using one -way ANOVA and included SSTR =7 , 102 and SSE = 10 ,511. Are all 8 tapes equally appealing on average? Determine p value?
For a sample of students in the college of business administration at mid-atlantic university, the mean grade point average is 3.10 with a standard deviation of 0.25.
What is the probability of selecting a female or an accounting major? Which rule of addition did you apply?
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