MGBA - 520 Quiz 4

An experiment has three steps with three outcomes possible for the first step, two outcomes possible for the second step, and four outcomes possible for the third step. How many experimental outcomes exist for the entire experiment?

question (9):   A researcher was interested in the effect of job security on stress. The researcher recruited a random sample of 10 individuals  who had job security and 10 individuals  who were employed on a 1 year contract. The researcher measured the stress hormone through a saliva sample. This is an independent sample design; TRUE OR  FALSE

Q3 A researcher wish to compare four manufacturing methods on the breaking strength of plastic. Four types of machines are used in this experiment. He believed that machines have an effect on the plastics breaking strength. However, each machine can operate only three methods during the experiments on a given day. Table Q3 shows the data of the experiment. Table Q3: Four manufacturing methods on the breaking strength of plastic Manufacturing Methods Machine 2 1 A=73 C=73 D=75 2 A=74 B=75 C=75 3 B=67 C=68 D=72 4 A=71 В-72 D=75 What is the name of the design? Write an appropriate statistical model then list the assumptions and identify the terms. (a) (b) Is this design symmetric ? Justify your answer. State if the design balance or not. Discuss how to achieve balance in this design ? Justify your answer. (c) (d) Test the hypothesis at a = 0.05 whether there is an effect of the four manufacturing methods on the breaking strength of plastics.

Question Dr. King is concerned that STA 2381 students aren't studying enough. There are 7 sections of STA 2381, each with 45 students. She randomly samples 12 students from each class and finds that 27% of the sampled students study less than 10 minutes a day. Another professor doesn't think this could be true and after talking to all of the STA 2381 students finds that 11 % actually study less than 10 minutes a day, 24 The other professor's finding of 11% is 000000OOOOO0 25 a statistic which is a random variable. a statistic which is a constant. an error. a parameter which is a constant. a random variable. a parameter which is a random variable. Dr. King's initial finding of 27% is an error. a random variable. a statistic which is a random variable. a statistic which is a constant. a parameter which is a constant. a parameter which is a random variable.

Question #4. US Universities found that 72% of people are concerned about the possibility that their personal records could be stolen over the Internet. If a random sample of 300 college students at a Midwestern university were taken and 228 of them were concerned about the possibility that their personal records could be stolen over the Internet, could you conclude at the 0.025 level of significance that a higher proportion of the university's college students are concerned about Internet theft than the public at large? Report the p-value for this test. Z0.025 = 1.96

Cigarette Consumption Data: A national insurance organization wanted to study the consumption pattern of cigarettes in all 50 states and the District of Columbia. The variables chosen for the study are given in Table 3.16. The data from 1970 are given in Table 3.17. The states are given in alphabetical order. The data can be found in the book’s Web site. In (a)-(b) below, specify the null and alternative hypotheses, the test used, and your conclusion using a 5% level of significance (d) What percentage of the variation in Sales can be accounted for when Income is removed from the above regression equation? Explain. (e) What percentage of the variation in Sales can be accounted for by the three variables: Price, Age, and Income? Explain. (f) What percentage of the variation in Sales that can be accounted for by the variable Income, when Sales is regressed on only Income? Explain. State Age HS Income Black Female Price Sales AL 27 41.3 2948 26.2 51.7 42.7 89.8 AK 22.9 66.7 4644 3…

To perform a certain type of blood analysis, lab technicians must perform two procedures. The first procedure requires either one or two separate steps, and the second procedure requires either one, two, or three steps. (a) List the experimental outcomes associated with performing the blood analysis. (Select all that apply.) (1)(2)(3)(1, 1)(1, 2)(1, 3)(2, 1)(2, 2)(2, 3)(3, 1)(3, 2)(3, 3) (b) If the random variable of interest is the total number of steps required to do the complete analysis (both procedures), show what value the random variable will assume for each of the experimental outcomes. (If an experimental outcome does not occur, enter NONE.) ExperimentalOutcome Number of StepsRequired (1)   (2)   (3)   (1, 1)   (1, 2)   (1, 3)     ExperimentalOutcome Number of StepsRequired (2, 1)   (2, 2)   (2, 3)   (3, 1)   (3, 2)   (3, 3)

Experiments are the next most convenient technique for gathering information on many variables. True or False

Help needed pls

What are the advantages of conducting experiments with more than two groups or conditions?

Z=, P-Value=