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1. Do men and women have different beliefs on the ideal number of children in a family? Based on the following GSS2008 Data and the obtained t statistics, what would you conclude? (0.05)
Men Women
Mean ideal number of children 3.06 3.22
Standard Deviation 1.92 1.99
N 610 610
2. Data from the MTF2008 reveal that 75.7% (493 out of 651) of males and 62.2% (405 out of 651) of females reported trying alcohol. You wonder whether there is any difference between males and females in the population trying alcohol. Use a test of the difference between proportions when answering this question. What is the research hypothesis? Should you conduct a one-or a two-tailed test? Why? Test your hypothesis at the 0.05 level. What do you conclude?
If Kim expects to use phone for 21 hours per month, which plan must she choose?
A job placement director claims that the average starting salary for nurses is 24,000.A sample of 10 nurses' salaries has a mean of 23, 450 and a standard deviation of 400. Is there enough evidence to reject the director's claim at 0.05 level of s..
The standard screening test for Down's Syndrome is based on combination of maternal age and the level of serum alpha-fetoprotein. Using this test 80% of Down's syndrome cases can be identified, while 5 % of normals are detected as positive.
Finding and retaining good health care professionals requires an agressive recruitment effort. Since the demand for health care professionals is growing and the supply of these workers is not keeping pace, an untapped source of workers retired emp..
What is the Bonferroni adjustment? What would the Bonferroni adjustment be for a study with four groups for which a researcher decided to use t-tests?
A jar contains 12 marbles, 5 of which are blue and 7 of which are red. If 4 marbles are chosen at random and without replacement, what is the probability of selecting 3 blue ones and 1 red one?
If he were to conduct a second study to reduce the maximum error of estimate to 6, about how many hard drives should he include in his new sample?
How large random sample of potential voters will be required to evaluate result with 95% confidence and with margin of error of plus and minus 3%?
Carry out a t-test to see if the mean healing rate is significantly lower in the experimental limbs, including all 12 newts. What are the test statistics and their P-values?
The times it takes workers to complete a task at a certain assembly plant are normally distributed with mean = 10 minutes and standard deviation = 2 minutes.
A microeconomist wants to determine how corporate sales are influenced by capital and wage spending by companies. She proceeds to randomly select 26 large corporations and record information in millions of dollars.
A teacher wants to know if students in her biology class did significantly better on an exam after instruction using authentic learning. The scores pre and post test are listed below. Based on an α = .05, what can the teacher conclude?
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