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1. How does technological advancement affect the ability to collect data? Does this advancement increase or decrease the chance for errors?
2. What are some critical decisions involved in selecting an appropriate measurment scale? How might these decisions influence the research design?
3. What is the importance of pretesting questions in an insturment you are developing? How might you go about doing such a pretest?
Find the margin of error for the estimator in this survey for a 95% level of confidence . In part c, what does the 95% level of confidence imply in relation to the margin of error?
A random sample of 15 customers is selected, and the results are as follows: 8.02 4.08 5.79 8.73 5.47 5.64 8.01 10.49 8.35 5.9 9.66 9.91 3.82 6.68 6.17 a) calculate arithmetic mean, median, mode, first quartile and third quartile.
Using the following number of flirtations actions in the 4 hour period, test the "null hypothesis'
At the .10 significance level you will test to determine if there has been an increase in selling time. Is this a 1 or 2 tail test?
What sample size would be needed to obtain an error of ±10 square millimeters with 99 percent confidence?
At the .01 significance level, is there a relationship between job pressure and age?
The weight of a product is normally distributed with a standard deviation of .5 ounces. What should the average weight be if the production manager wants no more than 5 percent of the products to weight more than 5.10 ounces.
To avoid the problem of not having access to Tables of F distribution with values given for the lower tail, the numerator of the test statistic should be the one with:
According to Chebyshev's theorem, proportion of values from data set that is further than 2 standard deviations from the mean is at most?
Test whether race and NATFAE are independent (α = 0.05). What do you conclude?
Find a 90% confidence interval for the mean amount left by all groups.
A sample of 19 albino Hungarian banded aardvarks was examined for nose length. Since this is a small sample, how various degrees of freedom will be used to find the t-score.
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