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Question: A study wants to determine if taking fish oils can reduce depressive symptoms. A group of 50 volunteers who suffered from mild depression were randomly divided into two groups. Each person was given a three-month's supply of capsules. One group was given capsules that contained fish oils while the other group was given capsules that look and tasted like fish oils, but actually only contained sugar. Neither the participants nor the investigator knew what type of capsule they were taking. At the end of the month, a psychologist evaluated them to determine if their depressive symptoms had changed. Therefore, we are comparing the "change in depressive symptoms" for these individuals in the two groups. Explain whether each of the following terms applies to this study.
a. observational study
b. randomized experiment
c. placebo
d. placebo effect
e. single-blind
f. double-blind
g. matched pairs (dependent samples)
h. block design
i. independent samples
j. explanatory variable (What is it?)
k. response variable (What is it?)
In a large section of statistics class, the points for the final exams are normally distributed with a mean of 72 and a standard deviation of 9. Grades are to be assigned according to the following rule.
Samples t test and one that would require a dependent samples t test. And explain what they mean and why they are independent or dependent samples.
Six houses were selected and each appraiser provided an appraisal for each of the six houses. What would be the best statistical test to use for the analysis of this data?
Evaluate the strength of the relationship by computing the coefficient of determination.
The State Game Commission set on length, if it is desired that 91% of the fish caught may be kept by fisherpersons? There is no limit on size for trout that exceed the minimum.
Construct the 90% confidence interval for the true population proportion of all voters in the state who favor approval.
Illustrate what amount of sales would be required to be a super savings club member. Elucidate amount of sales would be required to be a gold club status.
Cold Stone Creamery has recorded demand for the particular flavor of ice cream during first seven days of July. Results are as follows: Forecast the sales for 8th day of July using 5-day moving average.
provide me with a simple brief statement about the post belowcorrelation does not imply causation is a phrase that
If 40 voters are chosen at random and X is the number of voters that support this referendum, find the standard deviation of X.
Nitrogen and Seagrass. The seagrass Thalassia testudinum is an integral part of the Texas coastal ecosystem. Essential to the growth of T. testudinum is ammonium.
Is there evidence of difference in mean life of bulbs produced by the two kinds of machines. What is your conclusion?
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