You must show you work if a problem involves more than one step of logical infer

Question

You must show you work if a problem involves more than one step of logical inferences and/or numerical manipulations. 1. A random sample is one a. That is haphazard b. That is unplanned C. That ensures that there will be no uncertainty in the conclusions In which every unit of a particular size has an equal probability of being selected 2. Stratified sampling._ a. Can be more representative than simple randomized sampling b. Can be used if the population has a number of distinct groups c. Is done by randomly sampling from subgroups in a way that is proportional to their size in the population d. All of the above 3. In an experiment on the effect of exercise on memory, the independent variable is -(choose only one answer) a. Recall score on a memory test b. Gender of the subjects C.Number of hours of exercise d. Gender of the experimenter For the scores 3, 5, 8, 10, 14, 17, 21, 25, calculate the 75th percentile using the following formula: R-P/100 x (N+1) 4. a,6.75 b. 20 d. 21 5. The area under the curve of a probability distribution is a. 0 b. 100 c. .68

Explanation / Answer

Q1) Option D is Correct

Q2) Option D is Correct

Q3) Option C is Correct. No of hours of exercise should be the independent variable

Q4) R= (75*9)/100 = 6.75

So, 75th Percentile = 17+0.75*(21-17) = 20

Option B is Correct

Q5) Option C is Correct. It can't be 0 or neither 100. Should be between 0 to 1

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