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The director of Heating and Oil at Mitchell Brothers Company is concerned about the high cost of home heating oil being offered to their customers for the upcoming Fall season in Boston, MA. The company has no possibility of modifying the oil price under the current economic conditions. He believes that the company should offer a low cost maintenance contract to foster good will. The director decides to survey a sample of the surrounding towns to see what people are paying for similar home maintenance contracts. The telephone sample of 20 homes indicated that the customers are paying X (bar) = $165.4 and s = $22.20 for a yearly contract.
a. Using the 0.05 level of significance, is there evidence that the population mean is above $170?
b. What is your answer in (a) if s = $50 and the 0.10 level of significance is used?
c. What is your answer in (a) if X (bar) = $179.00 and s = $20.20?
A manufacturer wants to increase the shelf life of a line of cake mixes. past records indicate that the average shelf life of the mix is 216 days. after a revised mix has been developed, a sample of nine boxes of cake mix gave these shelf lives (i..
Find the minimum amount of water pumped in 30 days. Let y be the total number of gallons pumped x days after pumping being. Note that (0,0) is on graph of the equation.
What kind of correlation do you expect to find between annual income and amount spent on car? Will it be positive or negative?
Is there evidence that the population mean amount is different from 8.17 ounces? (Use a 0.05 level of significance and determine the p-value and interpret its meaning.
The average time a subscriber spends reading the Wall Street Journal is 49 minutes. Assume that the standard deviation is 16 minutes and the time are normally distributed .
There're several measures of central tendency. By far the most frequently utilized of these measures is mean of population. Remember that the source of the data that you want to analyze always comes from what is called a population.
If one NBA player is selected at random, find the probability that this player is either 7 feet tall or weighs over 200 pounds.
Using equation presented calculate SST,SSE and SSr. Determine least squares regression line for this data.
Use this information to construct a probability table, and then calculate each of the following probabilities:
Now suppose that a finished product is randomly selected. What is the probability that it is defective?
The National Survey of Student Engagement (NSSE) surveys freshmen and seniors about their level of engagement in campus and classroom activities that enhance learning.
The ANOVA table is given below,as well as a table of means and standard deviations for the three groups. Evaluate the t statistic for testing contrast
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