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1. In an experiment on the uptake of solutes by liver cells, a researcher found that six determinations of the radiation, measured in counts per minute after 20 minutes of immersion, were:
2728 2585 2769 2662 2876 2777
Construct a 99% con?dence interval for the population median and interpret its meaning.
2. The nominal resistance of a wire is 0.20 ohm. A testing of the wire randomly chosen from a large collection of such wires yields the following resistance data.
0.199 0.211 0.198 0.201 0.197 0.200 0.198 0.208
Obtain a 95% con?dence interval for the population median.
Researchers wanted to determine if there is a difference in the mean credit card debt owed by males versus females. Using α = 0.10, is there a difference. (Show all six steps of hypothesis testing.)
Identify a business situation where you might want to make an estimate. For example, you might want to estimate the mean dollar amount spent by customers at a retail store.
As EEC's corporate business financial analyst, you will need to have a clear understanding of the different types of costs (variable, fixed, and mixed) that the company carries. Complete the following for this assignment:
In a test of the independence of two variables, one of the variables has two possible categories and the other has three possible categories.
Find the 90% confidence interval for the mean, variance, and standard deviation for the price in dollars of an adult single-day ski lift ticket.
what are the z scores above and below the mean that contain the middle 90 of a normal
A sample of 50 customers resulted in a sample mean of $90. What is the probability of obtaining a sample with a sample mean smaller than $90?
in a probability class 45 of the students pass the class 20 of the students fail the class and 35 of the students drop
the standard deviation of the lifetime of a sample of 15 electric light bulbs was computed to be 98 hours and the
This paper is a detailed and comprehensive review of statistical research performed by others on a business related topic of the student's choice.
What does a squared correlation coefficient represent? Also, does the strength of the correlation depend on the direction? Finally, does correlation imply causation.
For this case, we will examine some hypothetical data concerning interest rates and the number of housing starts per month. A new "housing start" is counted when a contractor begins construction of a new private house.
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