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A researcher would like to determine whether an over-the-counter cold medication has an effect on mental alertness. A sample of n = 16 participants is obtained and each person is given a standard dose of the medication one hour before being tested in a driving simulation task. for the general population reaction time scores on the simulation task are normally distributed with the population mean = 210 and alpha = 20. The individuals in the sample had an average score of M = 222. Can the research conclude that the medication has a significant effect on mental alertness as measured by the driving simulation task? Use a two tailed test with alpha = 0.05. Compute Cohen's d to measure the size of the effect.
The managers of a brokerage firm are interested in finding out if the number of clients a broker brings into the firm affects the sales generated by the broker.
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.
What is the probability that a randomly chosen package is improperly sealed?
Bags of tea are sampled to ensure proper weight. The overall average for samples is 8 ounces. Each sample contains 10 bags. The average range is 0.1 ounces.
Experience raising New Jersey Red chickens revealed the mean weight of the chickens at five months is 4.35 pounds. The weights follow the normal distribution.
According to the National Football League, the average salary for players for the 2010 season was about $1.9 million while the median salary is around $770,000. Why are both numbers reported? What might the difference between the two statistics me..
A presidential candidate's aide estimates that, among all college students, the proportion p who intend to vote in the upcoming election is at least 60%.
What type of probability distribution is appropriate for this problem? Determine the probability of getting no calls between eight and nine in the morning. Calculate the probability of getting exactly five calls between eight and nine in the morning
Assuming 250 of each sex, can we conclude that there is a significant difference in the proportions at a 0.05 level of significance?
Please use words to describe the solution, not just symbols. (basically, explain what is going on in addition to an answer) Use a math symbol editor where appropriate.
Shoveling Heart Rates Because cardiac deaths appear to increase after heavy snowfalls, an experiment was designed to compare cardiac demands of snow shoveling to those of using an electric snow thrower.
Converting data to indexes makes it easier to compare the trend in a series composed of exceptionally large numbers.
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