1. a student computes a standard deviation of 12 . will the variance differ if 1
ID: 3302295 • Letter: 1
Question
1. a student computes a standard deviation of 12 . will the variance differ if 12 is the value for a population versus a sample standard deviation? explain
2. if a sample has a variance of 4 and sample of 2 has a variance of 32, can we tell which sample had a larger range? if so, which sample had a greater range.
3. a researcher measures the time in seconds, it takes a sample of five participants to complete a memory task. it takes four of the participants 5,6,6, and 7seconds . if M=7 then what must be the fifth time recorded?
4. a professor records the time in minutes that it takes 16 students to complete an exam. compute the SS, the variance and the standard deviation , a) assuming the 16 student constitude a population and b) assuming the 16 students constitude a sample
Explanation / Answer
1)
No, in both cases, the standard deviation is the square root of the variance. Hence, the population and the sample variance will be 12
3) fifth time recorded = 7 *5 - (5 + 6 +6 +7)
= 11
Post Q2 and Q4 again
I think data is missing in Q4
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