Imagine a researcher wanted to examine the effects of gender (male or female) and employment type (seasonal, part-time, or full-time) on number of years employed. How many factors are in this study? (1), can not determine (2). 6 (3). 3 (4). 2
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Imagine a researcher wanted to examine the effects of gender (male or female) and employment type (seasonal, part-time, or full-time) on number of years employed. How many factors are in this study?
(1), can not determine
(2). 6
(3). 3
(4). 2
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- What is a binomial coefficient, and how it is calculated?In a research study to test a new drug on patients with brain cancer, patients were divided into 2 groups randomly. One group received the drug and the other group did not receive the drug. After 6 weeks, the measured results showed reduction in symptoms among the first group who received the drug. Is this an example of an observational study or experimental study? If it is an experiment, what is the controlled factor?A researcher would like to use a factorial study to compare two programs designed to help people stop smoking. The smoking behavior of each participant will be measured at the beginning of the program, at the end of the program, and again 4 months after the program has ended. Thus, the two treatment program make up one factor, three measurement times make up the second factor. For this study, which factor (s) should be between subjects and which should be within subjects?
- A study showed that the alumni of a college who had grades that were close to the average tended to have higher incomes than either the poor or very good students who graduated at the same time. Does this mean that very good grades are a handicap for those seeking high incomes? What other factors might cause this result?5) Suppose that you want to understand whether athletes who are older than80 years of age would have higher memory level if they sleep one more hour.What experimental research design should you take? Why did you choose the one over another? DiscussIn carrying out chi-square analysis, if one or more of the observed frequencies is less than five (5), rows or columns should be combined so that each value of observed frequency is at least 5. True or False?
- A research report concludes that there are significant differences among treatment conditions, with "F(2, 24) = 8.62, p<0.01." If the same number of participants was used in each of the treatment conditions, then how many individuals were in each treatment condition?A wine producer is interested in the effect of two oak types and two fermentation temperature ( 78 and 83 Fahrenheit) on the quality of wine, as decided by the average overall ranking by a panel of experts. In this problem, examine it and find the factors, levels, treatments, and type of experiment.A cognitive psychologist is interested in the effect that sleep has on daily stress levels. To investigate this, the psychologist recruits 88 participants and splits them equally into either a group that gets less than six hours of sleep each night or a group that gets more than six hours of sleep each night. At the end of each day, participants are asked to report their overall level of stress each day for a month. Those who had fewer than six hours of sleep on average reported stress levels of 6.3 (with most people falling within 1.7 hours of this average). However, those who had more than six hours of sleep reported stress levels of 3.5 (with most people falling within 2.8 hours of this average). Help the psychologist estimate the difference in stress levels based on amount of sleep. What would be the smallest amount of difference in stress in two populations that either got more or less than six hours of sleep? Does this study meet an assumption of HOV? For this study, what kind…
- If a newborn lab rat receives a hormone and its weight (in ounces) is converted into a z score that is greater than +2.00, what would the researcher most likely conclude about whether or not the hormone had an effect on the rat's weight?In a previous study, it has already been determined that a common ADD treatment is effective, but researchers want to determine what dosage level is most appropriate. You set up an experiment to consider the factor of dosage with two levels (300mg vs. 500mg). What would be the different treatment groups of the experiment within each block? Three groups: no drug/300mg of new drug/500mg of new drug Three groups: placebo/300mg of new drug/500mg of new drug Two groups: 300mg of new drug/500mg of new drug Two groups: placebo/ either 300 or 500mg of new drugA statistician wants to determine if there is a difference in the fuel efficiency of cars between model years. To do this, he selects random makes and models of cars and compares the fuel efficiency in miles per gallon of the current model year and the previous model year. Suppose that data were collected for a random sample of 9 cars, where each difference is calculated by subtracting the fuel efficiency in miles per gallon of the previous model year from the fuel efficiency in miles per gallon of the current model year. Assume that the fuel efficiencies are normally distributed. What type of test is this hypothesis test? A. This is a two-tailed test because the alternative hypothesis is Ha:μd≠0. B. This is a right-tailed test because the alternative hypothesis is Ha:μd>0. C. This is a right-tailed test because the alternative hypothesis is Ha:μd<0. D. This is a left-tailed test because the alternative hypothesis is Ha:μd<0. E. This is a left-tailed…
