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1. The average price of homes sold in the U.S. in the past year was $220,000. A random sample of 81 homes sold this year showed a sample mean price of $210,000. It is known that the standard deviation of the population is $36,000. Using a 1% level of significance, test to determine if there has been a significant decrease in the average price homes. Use the p value approach. Make sure to show all parts of the test, including hypotheses, test statistic, decision rule, decision and conclusion.
2. A sample of 30 cookies is taken to test the claim that each cookie contains an average of at least 9 chocolate chips. The average number of chocolate chips per cookie in the sample was 7.8 with a sample standard deviation of 3. Using a 5% level of significance, perform the hypothesis test using the critical value approach. Show all parts of the test, including hypotheses, test statistic, decision rule, decision and conclusion.
It is suspected that high pollution levels (measured by number of particulates found in the air) increase the levels of asthma attacks. A researcher collects data on50 people who experienced an asthma attack during the course of one year.
For many years TV executives used the guideline that 30 percent of the audience were watching each of the prime-time networks and 10 percent were watching cable stations on a weekday night.
Suppose all cities are directly connected except B and C are not directly connected. How many different flight plans are available to the salesperson?
What is the maximum error of estimate for p ?
assume that the mean score on a certain aptitude test across the nation is 100 and that the standard deviation is 20
Provide a plausible research question in the field of education that implies a bivariate correlation or regression. Identify your research question, your research (alternative) hypothesis, and your null hypothesis.
the owner of a small pet supply store wants to open a second store in another city but he only wants to do so if more
Which of the following would have a binomial distribution and evaluate the binomial coefficient
Suppose that 30% of the population has black hair. In a randomly-selected group of six people, how probable is it that
What is the distribution of X? State its mean and variance.
X has a normal distribution with a mean of 80.0 and a standard deviation of 3.5. Find the following probabilities:
a survey from teenage research unlimited found that 30 of teenage consumers receive their spending money from part-time
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