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As the prices of heating oil and natural gas increase, consumers become more careful about heating their homes. Researchers want to know how warm home- owners keep their houses in January and how the results from Wisconsin and Tennessee compare. The researchers randomly call 23 Wisconsin households between 7 P.M. and 9 P.M. on January 15 and ask the respondent how warm the house is according to the thermostat. The researchers then call 19 households in Tennessee the same night and ask the same question. The results follow.
Wisconsin Tennessee
71
65
68
73
75
74
70
61
67
69
72
For a = .01, is the average temperature of a house in Tennessee significantly higher than that of a house in Wisconsin on the evening of January 15? Assume the population variances are equal and the house tempera- tures are normally distributed in each population.
These individuals are then examined and categorized as to whether they have a heart disorder. The observed frequencies are as follows:
Compute average daily rainfall in the week and for weekends. Get the average of weekdays' rainfalls and average of weekend's rainfalls.
quality are reliability are becoming important aspects of computer hardware and software. past experience shows that
A sociologist wants to determine if the life expectancy of people in Africa is less than the life expectancy of people in Asia.
What is the probability that a person chosen at random is left-handed?
Focusing on the cost of a specific later unit in a large production run is often used as a means to more accurately compare steady-state production costs between different models of a product without the comparison being unduly influenced by the d..
A statistician is interested in determining whether food preferences depend on the country. The data is presented below. What is the correct statistical test for analyzing the data?
Many believe that GM's demise could lead to a ripple effect and cause many other businesses to go under. This ripple effect, many think, could cause the United States to slip out of a recession and lead the country into a depression.
suppose that 80 of the accounts are in error. What is the probability that the auditor will find that the sample proportion (P) of the accounts in error will exceedd 0.10?
create a dataset of at least 50 observations from your workplace or personal experiences. calculate the descriptive
Calculate the average of deposits per bank for FDIC- inured institutions during both time periods and describe the relationship between the two averages. Provide a reason for the difference.
The weekly proportion of storage tank capacity that is utilized at a regional hazardous liquid waste receiv ing site is an outcome of a Beta(8, 1) random variable. At the end of each week the storage tank is emptied. A random sample of a year..
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