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Question: a. What is an unpaired t-test?
b. Identify the two hypotheses involved in an unpaired t-test.
c. What is the "independence" requirement? Give a concrete example.
d. How is an unpaired t-test similar to and different from an ordinary t-test for just one sample?
e. When is each standard error appropriate? (Answer both in words and using a formula.)
f. What new assumption is needed for the unpaired t-test to be valid for small samples? What can you do if this assumption is grossly violated?
Construct a 95% confidence interval for the mean age of all customers, assuming that the assumptions and condi- tions for the confidence interval have been met.
An earthquake with magnitude of 1.0 to 4.0 is considered weak and generally causes minor or no damage. Is there any evidence to suggest the true mean magnitude of earthquakes is greater than 1.0?
The proportion of defective items generated by a manufacturing process is believed to be 8%. In constructing a p-chart for the process, determine how large the sample size should be to avoid ending up with a negative lower control limit.
Draw the appropriate conclusions with respect to female and male human resource manager salary levels. Calculate the t value for independent groups for the following data. Check the accuracy of your calculations.
The standard screening test for Down's syndrome is based on a combination of maternal age and the level of serum alpha fetoprotein. Using the test 80% of Down's syndrome cases can be identified while 5% of normals are detected as positives.
The average body temperature for healthy adults is 98.6° F. Is this statement true? Do all healthy people have exactly the same body temperature? A study was conducted a few years go to examine this belief.
What is the significance of the picture at the top of the t-table? What is the difference between a sample parameter (X-bar and s) and a proportion parameter (n)?
Keno. Keno is a popular game in casinos. Balls numbered 1 to 80 are tumbled in a machine as the bets are placed, then 20 of the balls are chosen at random.
Determine the equation of the line of regression and describe the apparent relationship between age and peak heart rate.
In contrast, the real millionaires, in terms of savings and investments, frequently come from "unglamorous" professions (particularly teaching), own unpretentious homes and cars, dress in inexpensive clothes, and othenvise lead rather ordinary liv..
If an occupation does not require a state-issued license for its practice, can it be considered a profession? Explore some examples that might fall into this category. Are there alternative ways for occupations to elevate their status without prof..
The random variables X1, X2, and X3 are independent and Exp(1)- distributed. Compute the correlation coefficient ρX(1) ,X(3). Let X1 and X2 be independent, Exp(a)-distributed random variables.
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