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Suppose a random sample of 100 U.S. companies taken in 2005 showed that 21 offered high-deductible health insurance plans to their workers. A separate random sample of 120 firms taken in 2006 showed that 30 offered high-deductible health insurance plans to their workers. Based on the sample results, can you conclude that there is a higher proportion of U.S. companies offering high-deductible health insurance plans to their workers in 2006 than in 2005? Conduct your hypothesis test at a 0.05 significance level.
a. State the null and alternate hypotheis
b. What is the level of significance?
c. What is the critical value?
d. Compute the value of the test statistic
e. What is your decision regarding the null hypothesis? Interpret the result.
1. you want to have 1 million in your investment account in 17 years and estimate that you ran earn an 12 rate of
consider you estimate the following regression model y alpha betax uwhere y is the dependent variable x is the
a) Explain why it would be hard to take a Simple Random Sample? b) Describe how to take a cluster sample of chocolate chip cookies.
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Cumulative frequency distribution, histogram, ogive and stem and leaf display. Calculate appropriate summary statistics. Incorporate these graphs and statistics into a well written summary
An environmental agency recently claimed more than 28% of consumers have stopped buying a certain product because of environmental concerns.
Delta Airlines quotes a flight time of 2 hrs, 5 minutes for its flights from Cincinnati to Tampa. We belive that actual flight times are uniformly distriubted between 2 hours and 2 hours 20 minutes.
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If a sample of 30 people selected from 300, find the probability that the mean will be less than 156 pounds using the correction factor.
a sample of 144 students is taken from a population of 2000 high school students to estimate the proportion of students
Consider that 10 observations were selected from a normal population whose variance is 64. Observations are: 58, 62, 45, 50, 59, 65, 39, 40, 41 and 52.
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