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Define the primary purpose of a linear correlation analysis. Define the primary purpose of a linear regression. Are theythe same? What are their differences and when would you use a linear correlati
The probability that exactly 7 out of 10 students carry an electronic pad with them to university is 0.0212. What is the probability that a student will carry an electronic pad?
A professor in the school of business wants to investigate the prices of new textbooks in the campus bookstore and the competing off-campus store, which is a branch of a national chain.
The grains composing polycrystalline metals tend to have weights that follow a log-normal distribution. For a type of aluminum, gram weights have a log-normal distribution with ? = 3 and ? = 4 (in u
What information does calculating standard deviation provide? How is the z-score related to standard deviation? What values do you need to calculate a z-score?
Apprx 10.3% of americans high school students drop out bf graduation. Choose 10 students entering school at randon, find the proability and the number of successes= graduates
Recent difficult economic times have caused an increase in the foreclosure rate of home mortgages. Statistics from the Penn Bank and Trust Company show their monthly foreclosure rate is now one loan
An article claims that movie attendance in the U.S. has declined significantly since 2008, but that there is still a minority of adult Americans who prefer to watch movies at home rather than at a t
Treat the sample results as simple random samples from large populations, and use a 0.01 significance level to test the claim that the illness rate on the first ship is less than the rate on the sec
A study has shown that 60% of families in a certain area have at least two cars. Find the probabilities that among 15 families
The distribution for the time it takes a student to complete the fall class registration has a mean of 94 minutes and a standard deviation of 10 minutes. For a random sample of 80 students, determin
At a city high school, past records indicate that the MSAT scores of students have a mean of 510 and a standard deviation of 90. One hundred students in the high school are to take the test. What is
Another summary measure is the "age-adjusted" mean, which is an estimate of the mean FVC value in a reference population with a speci?ed age distribution. This is given by the following linear combi
The average flight from point A to point B takes 100 minutes with a standard deviation of 10 minutes. What is the probability that a flight will take more than 95 minutes?
The probability of getting a defective widget is .10. You select five widgets for the National Widget Championship
Suppose there are 10 drawers, each containing two coins. Drawers 1 and 2 contain only gold coins, while in drawers 3;4 and 5 one is a gold coin and the other one is a silver coin, and rest of the dr
Using symbols, state the hypotheses (H0 and H1) for a two-tailed test. Find the critical value/region for an ? = .01 for a two-tailed test. Calculate the test statistic (t-statistic) for the sample.
Refer to the Buena School District bus data. Develop a 95 percent confidence interval for the mean bus maintenance.
Suppose that a hypothesis test is performed at a small significance level. State the appropriate conclusion in each case by referring to Key Fact 9.2. Key fact 9.2= If the null hypothesis is rejecte
An experiment was designed to compare several different types of air pollution monitors. The monitor was set up, and then exposed to different concentrations of ozone, ranging between 15 and 230 par
If my question of interest is if cactus needles are smaller the closer they are to a human trail, what would be a good null and alternative hypothesis?
The distribution of a population of mechanical aptitude test is normal, with a mean of 46 and a standard deviation of 4. To test the impact of a job training program, a sample of 26 scores was obtai
What is the probability of a randomly selected person having an IQ score about 80%? What is the probability of a randomly selected person having an IQ score between 120 and 130
Suppose that we want to estimate the proportion of recipes in the Better Homes and Gardens New Cook Book that do not involve animal products. We plan to take a simple random sample of the N=1251 kit
Two-way Anova between subjects anova is preformed when you have