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- 23. To test whether arousal or stress levels increase as the difficulty of a task increases, 24 participants (n = 8; N= 24) were randomly assigned to complete an easy, typical, or difficult task. Their galvanic skin response (GSR) was recorded. A GSR measures the electrical signals of the skin in units called microSiemens (µS), with higher signals indicating greater arousal or stress. The data for each task are given in the table. easy typical difficult 2.6 5.6 9.0 3.9 4.5 5.6 3.4 3.7 3.5 1.2 2.0 7.8 2.1 3.3 6.4 1.2 4.6 7.5 1.8 3.1 4.4 2.2 2.0 3.8 1. complete the F table and make a decision to retain or reject the null hypothesis 2. compute Turkeys HSD post hoc test and interpret the results.21 Suppose Pgo = 62 this means that 38% of observations greater than 62 ved t of e flag Select one: O True False Previ-5. The weight of a certains species of fish is normally distributed with mean of 4.25 Kg and standard deviation of 1.2 a) What proportion of fish are between 3.5 kg and 4 kg b) What is the probability that a fish caught will have a weight of at least 5kg? 31
- S2. Assume that x₁,...,10 € R satisfy ₁₁ = 3 and ΣΩ1x? standard deviation of ₁,... , X10? i=1 i=1 (This question appeared as is in May 2018 exam) = 10. What is the sample15. The dean of a university estimates that the mean number of classroom hours per week for full-time faculty is 10.0. As a member of the student council, you want to test this claim. A random sample of the number of classroom hours for eightfull-time faculty for one week is shown in the table below. At α=0.05, can you reject the dean's claim? Complete parts (a) through (d) below. Assume the population is normally distributed. 11.2 7.5 12.2 7.2 4.1 9.5 13.7 8.5 Question content area bottom Part 1 (a) Write the claim mathematically and identify H0 and Ha. Which of the following correctly states H0 and Ha? A. H0: μ>10.0 Ha: μ≤10.0 B. H0: μ≠10.0 Ha: μ=10.0 C. H0: μ<10.0 Ha: μ≥10.0 D. H0: μ≤10.0 Ha: μ>10.0 E. H0: μ≥10.0 Ha: μ<10.03. For the binomial distribution with the given values for n and p, state whether or not it is suitable to use the normal distribution as an approximation. n= 65 and p = 0.7 a. Normal approximation is not suitable. b. Normal approximation is suitable.
- 8. Given E(x,-)-78 and N= 80, then the population standard deviation, a, is approximately O a) 0.975 O b) 0.987 O0.994 Od) 0.110 SAMSUNG33. If X is a normal variate with mean u and variance X- o? and P - b< .2Kk.326.2. Suppose that we are testing Ho following observed values of the test (a) Zo= 2.45 (b) Zo= -1.53 = po versus H₁>po. Calculate the p-value for the statistic: (c) Zo= 2.15 (e) Zo= -0.35 (d) Zo = 1.951. Suppose we wish to test Ho: µ = 47 versus Ha: µ > 47. What will result if we conclude that the mean is greater than 47 when its true value is really 52? a. We have made a Type II error. b. We have made a Type I error. c. We have made a correct decision. d. None of the choices is correct. 2. A scientist would like to test if a certain vaccine’s side effect is increased heart rate. To test this claim, a random sample of 35 human subjects were tested and it was found out that their average resting heart rate is 87 beats per minute (bpm). Studies suggest that the average resting heart rate of a normal adult is around 80 beats per minute (bpm) with a standard deviation of 20 beats per minute (bpm). Which of the conclusion is supported by the data at 0.01 level of significance? a. The vaccine does not significantly increase the average resting heart rate. b. There is no sufficient evidence to say that the vaccine significantly increase the average resting heart rate. c. The vaccine…15. a. After 6 points have been added to every score in a sample, the mea is found to be M = 70 and the standard deviation is s = %3D = 13. What were the values for the mean and standard deviation for the original sample? b. After every score in a sample is multiplied by 3, the mean is found to be M = 48 and the standard deviation is s = 18. What were the values for the mean and standard deviation for the original sample? %3DSEE MORE QUESTIONS