Answer the following questions without making any calculations: a) A researcher measures weights of Rat A and Rat B, 8 animals from each of the species were weighed and 95% CI on the means of the weights was calculated. Length of CI of Rat A mean weight was 20 mm, length of CI of Rat B mean weight was 30. Which rat type has a more variant weight? Explain your answer. b) A hypothesis test was performed to test if variance of a dataset is different than 3.5 or not, by using α = 0.05. The dataset had 8 samples, and value of the test statistic was 20. What was the hypothesis, which test was used, was it rejected or accepted? c) 200 autistic children were given an IQ test. The researcher wants to compare their average IQ to IQ of the general public. Which hypothesis test should they use and why? d) Do you prefer to have high Type I error or high Type II error in your hypothesis test? Why?
Answer the following questions without making any calculations:
a) A researcher measures weights of Rat A and Rat B, 8 animals from each of the species were weighed and 95% CI on the means of the weights was calculated. Length of CI of Rat A mean weight was 20 mm, length of CI of Rat B mean weight was 30. Which rat type has a more variant weight? Explain your answer.
b) A hypothesis test was performed to test if variance of a dataset is different than 3.5 or not, by using α = 0.05. The dataset had 8 samples, and value of the test statistic was 20. What was the hypothesis, which test was used, was it rejected or accepted?
c) 200 autistic children were given an IQ test. The researcher wants to compare their average IQ to IQ of the general public. Which hypothesis test should they use and why?
d) Do you prefer to have high Type I error or high Type II error in your hypothesis test? Why?
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