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A study conducted by the research department of a pharmaceutical company claims that the annual spending (per person) for prescription drugs for allergy relief,is greater than or equal to the annual spending (per person) for non-prescription allergy relief medicine. A health insurance company conducted an independent study and collected data from a random sample of 235 individuals for prescription allergy relief medicine. The sample mean is found to be 17.6 dollars/year, with a sample standard deviation of 4.8 dollars/year. They have also collected data for non-prescription allergy relief medicine. An independent random sample of 275 individuals yielded a sample mean of 18.4 dollars/year, and a sample standard deviation of 3.6 dollars/year. Since the sample size is quite large, it is assumed that the population standard deviation of the sales (per person) for prescription and non-prescription allergy relief medicine can be estimated by using the sample standard deviation values given above. Is there sufficient evidence to reject the claim made by the research department of the company, at the .05 level of significance? Perform a one-tailed test.
Suggest one psychological research question that could be answered by each of the following types of statistical tests:
An analysis of 1,000 cellular phone calls made from company phones at the offices of Kant, Taekitini, Moore, LLC reveals that the length of these calls is normally distributed, with m = 240 seconds and s = 40 seconds.
Interpret the correlation between each set of variables.
Any analysis required to check the required conditions (note that if you find that you cannot meet the required conditions for the test you expected to do, you must use the appropriate non-parametric test)
Calculate the mean of the 20 samples and draw a histogram showing the 20 sample means and describe the distribution of the x-bars that you see in part b (shape of distribution, center, and the amount of dispersion).
Compare and contrast random selection and random assignment. Be sure to include a discussion of when you would want to do one or the other and the possible consequences of failing to do random selection or random assignment in particular situation..
We are interested in testing to see if the variance of a population is less than 7. The correct null hypothesis is:
Which sessions, morning or afternoon, had more stable or uniform attendance over three-day period? Describe by using the suitable calculation for each data set and compare two calculations .
The union for a particular industry has determined that the standard deviation of the daily wages of its workers is $20.. A random sample of 100 workers in this industry has a mean daily wage of $116.
Using standard methods for linear statistical prediction, find the percent increase in sales revenue that would be expected if the price were lowered by 15%. Find the usual measure of the strength of association between price reduction and sales re..
Choose one of these tests and describe in your own words, the purpose of the test, any particular assumptions or limitations pertaining to the test, and provide an example where you could employ the test.
Describe 5 data collection techniques in your own words. Explain why the four demographic questions you included in your survey are important and or are of interest to the study.
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