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A sociologist wanted to study if divorce rates within the first year of marriage were any different in Illinois than they were in California. 100 married couples were selected at random in Illinois. Of those, 28 couples were divorced or had filed for divorce within the first year of marriage. 150 couples were randomly selected in California. Of those, 48 couples were divorced or had filed for divorce within the first year of marriage. Is there sufficient evidence to show a difference between divorce rates in Illinois and California during the first year of marriage? Test at a .10 level of significance.
A leasing firm claims that the mean number of miles driven annually,M , in its leased cars is less than 13020 miles. A random sample of 90 cars leased from this firm had a mean of 12750 annual miles driven.
Studies have shown that humans complete a 1 mile run in an average of 12.2 minutes. There is a separate group of 30 who complete a 1 mile run with an average of 8.67 minutes with a standard deviation of 0.33 minutes.
scatter plot correlation coefficient and regression equation.do a complete regression analysis by performing the steps
suppose that 65 of all adults regularly consume coffee 50 regularly consume carbonated soda and 75 regularly consume
Compared for 5 randomly selected days at three plants. Does the data prove a significant difference in mean scrap rates? Which pairs of mean scrap rates differ significantly (3 plants)?
When we take the sample of 100 of these average is $500 and SD is $100. (a) Determine statement to make about range $300 to $700?
The participants in a television quiz show are picked from a large pool of applicants with approximately equal numbers of men and women.
1. you are trying to determine the average age of students at cuyamaca college. the average age of 50 randomly selected
you want to compare response rates percents of two regimens. a power of 90 and a two-sided test of size 0.05 are
a consumer group rated 12 manufactured products imported from a single source on a scale of 1 to 10. the data are shown
He stuffs each letter into one of the preaddressed envelopes and seals them. What is the probability that each letter is in the correct envelope?
what is the probability that a salesperson selected at random will have an excellent potential for advancement given
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