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Bill heats his house with natural gas. The gas usage is measured in therms (T). In January of 2007 he used 125 therms over 34 days (D) and the average temperature (T) was 49 degrees farenheit. This year in January he used 190 therms over 31 days and the average temperature was 43 degrees. He wants to know if the added usage was because of the lower average temperature or if he was being wasteful. How would you calculate the answer to that question? Can you develop an equation to normalize the usage for temperature and number of days?
Two colored dice are tossed. What is the probability that the sum of the numbers shown on the upper faces is equal to 7?
The number of arrivals per minute at a bank located in the central business district of a large city was recorded over a period of 200 minutes, with the following results:
Using a critical value, test hypothesis at the 1% level of significance.
The university police department must write, on average, five tickets per day to keep department revenues at budgeted levels. Suppose the number of tickets written per day follows Poisson distribution with a mean of 9 tickets per day.
There were 23 people at my last Arachnophobics (fear of spiders) Anonymous' Halloween party. As a gag fake spiders were put into the gift boxes to be handed out when people came in.
Evaluate the value of population proportion. Develop a 99% confidence interval for population proportion.
For the most recent year available the mean annual cost to attend a private university in the US was $26,889. Assume the distribution of annual costs follows a normal probability distribution and the standard deviation is $4,500. 95% of all studen..
Assume rf is 5% and rm is 10%. According to the SML and CAPM, an asset with a beta of -2.0 has a required return of negative 5%[=5-2(10-5)]. Can this be possoble?
This linear regression model was fitted to a sample of size 50 to produce the following regression equation: yhat = 145 + 1.2x1 + 300x2.
If sensitivity and specificity remain constant, determine the relationship of prevalence to predictive value positive and predictive value negative?
Suppose that the two lists are combined to produce a new list of 18 values. What is the average (mean) of this new list?
Which of the following events are disjoint and What proportion of the females rated their intelligence less than 7.
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