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Stats Midterm 2

mlmallamas 41 perguntas 4.308 visualizações

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  1. 1A crop scientist is conducting research with a drought resistant corn hybrid. She is interested in determining if increasing the spacing between these plants will increase yield. She prepares 20 single acre plots and randomly assigns 10 to have normal spacing while the other 10 are planted with an expanded spacing. The resulting average yield for each group of 10 plots was recorded.
    1. AThe explanatory variable is whether the corn plants had normal spacing or expanded spacing
    2. BThe response variable is the yield of the crops.
    3. CThe explanatory variable is the yield of the crops.
    4. DThe response variable is whether the corn plants had normal spacing or expanded spacing.
    5. EThis study is best described as an experiment.
    6. FThis is best described as an observational study.
  2. 2Does daily cardio exercise make subjects perform better on tests of intelligence? A study was conducted in which the daily habits of 45 college students were documented, focusing on the number of hours spent on exercise in a week.After a week, the subjects were given a computer-based intelligence test on which they receive a score on a 0 to 100 point scale.Their scores were compared with how many hours they spent exercising that week.
    1. AThe explanatory variable is the score on the computer-based intelligence test.
    2. BThe response variable is the score on the computer-based intelligence test.
    3. CThe explanatory variable is the number of hours exercised during the week.
    4. DThe response variable is the number of hours exercised during the week.
    5. EThis is best described as an observational study
    6. FThis study is best described as an experiment.
  3. 3About 870 men took part in a study to study the effectiveness of a hormone therapy. Half of the men were selected randomly to come in and receive the hormone therapy while the other half were told to stay home and thus did not receive the therapy. After about a year, blood tests were conducted on each subject by a lab technician who was aware of which group (treatment or those given nothing) the blood samples originated from. In presenting the results of the experiment, the authors reported that the men in the treatment group had experienced a statistically significant increase in HDL (the so-called "good" cholesterol) and a statistically significant reduction in LDL (the so-called "bad" cholesterol) when compared with the control group.
    1. AThis study would be classified as double-blind.
    2. BThis study would be classified as single-blind.
    3. CThis study would be classified as un-blinded.
    4. DThe subjects are the 870 men in the study.
    5. EThe subjects are the blood tests.
    6. FThe treatments are the HDL and the LDL.
    7. GThe treatments are the hormone therapy or the absence of it.
    8. HThis is an example of a completely randomized design.
    9. IThis is an example of a block design.
    10. JThis is an example of a matched pairs design.
  4. 4A personal trainer believes that his new workout plan of lifting weights combined with cardio may help his clients lose more body fat than a workout plan of just cardio. To test his theory, he asks locals to sign up to participate in his study. 36 men and 24 women sign up for the study. The trainer also thinks the treatment will work differently on men and women. Therefore, he divides the group into men and women and then randomizes the two treatments within each group. The trainer measures the body fat of each participant, and then measures it again after three months when the workout plan has been completed.
    1. AThis is an example of a block design.
    2. BThis is an example of a completely randomized experiment.
    3. CThis is an example of a matched pairs experiment.
    4. DThe subjects are the 36 men and 24 women.
    5. EThe subjects are the body fat measurements of the participants.
    6. FThe treatments are the cardio/weights program and the cardio program.
    7. GThe treatments are the body fat measurements of the participants.
  5. 5Use the following information to answer questions 1 through 3.
    Dr. Cawood's class is presented with a large bin that contains small plastic beads. The beads in the box are either purple or white. Dr. Cawood states that 25% of the beads are purple but Oliver, a student in Dr. Cawood's class believes that more than a quarter of the beads in the model box are purple.

    Select both a null and alternative hypothesis that represent this situation. Be careful of notation.
    1. AHA: p=0.25
    2. BHA: p≥0.25
    3. CH0: p<0.25
    4. DH0: p>0.25
    5. EHA: p≠0.25
    6. FH0: p=0.25
    7. GHA: p<0.25
    8. HHA: p>0.25
  6. 6Use the following information to answer questions 1 through 3.
    Dr. Cawood's class is presented with a large bin that contains small plastic beads. The beads in the box are either purple or white. Dr. Cawood states that 25% of the beads are purple but Oliver, a student in Dr. Cawood's class believes that more than a quarter of the beads in the model box are purple.

    Oliver takes a random sample of beads and finds that 16 out of the 44 beads sampled are purple. What is the p-value associated with the hypothesis test from Question 1?

    Give your answer to 4 decimal places. For help on how to input a numeric answer, please "Instructions for inputting a numeric response."
    1. A.0465
    2. B.0338
    3. C.5920
    4. D.0512
  7. 7Based on the p-value that you calculated in Question 6, what conclusion can be made about your hypothesis?
    1. AThere is enough evidence to suggest that the proportion of purple beads in the model box is more than 25%
    2. BThere is enough evidence to suggest that the proportion of purple beads in the model box is less than 25%
    3. CThere is enough evidence to suggest that the proportion of purple beads in the model box is equal to 25%
    4. DThere is not enough evidence to suggest that the proportion of purple beads in the model box is more than 25%
    5. EThere is not enough evidence to suggest that the proportion of purple beads in the model box is less than 25%
    6. FThere is not enough evidence to suggest that the proportion of purple beads in the model box is equal to 25%
  8. 8A large office building has four entrances through which people can enter. One of the four entrances has had improved landscaping installed. An industrial psychologist wanted to see if people tend to use the entrance that has the improved landscaping more often. Using the buildings video survillance system he randomly selected 200 people who entered the building. He found that 80 (40%) of the 200 entered through the improved entrance. He would like to determine if this significantly more than we would expect if all the entrances were equally likely. To determine this he will conduct a test of
    H0: p=0.25
    Ha: p>0.25

    In carrying out his test what null distribution should he use?
    1. A A normal distribution centered at 0.25 with standard deviation 0.035
    2. B A normal distribution centered at 0.40 with standard deviation 0.035
    3. CA normal distribution centered at 0.40 with standard deviation 0.030
    4. D A normal distribution centered at 0.25 with standard deviation 0.030
  9. 9We are conducting a test of the hypotheses
    H0: p=0.2
    Ha: p>0.2
    We find a test statistic of Z=1.32. What is the corresponding p-value? Give your answer as a proportion between 0 and 1 to 4 decimal places.
    1. A.0934
    2. B.0372
    3. C.0561
    4. D.0833
  10. 10We are conducting a test of the hypotheses
    H0: p=0.2
    Ha: p≠0.2
    We find a test statistic of Z=1.24. What is the corresponding p-value? Give your answer as a proportion between 0 and 1 to 4 decimal places.
    1. A.2150
    2. B.3463
    3. C.2319
    4. D.5639

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Quiz sobre Stats Midterm 2, criado por mlmallamas em 04-11-2014.
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English
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