Search 78,078 tutors

## Vivian from Burlington, NC's Resources

If we have an SRS of 1600 students and the sample mean = 148.  Compare with an SRS of 900 students with the margin of error for a 95% confidence interval of µ is ?  the answer should be...

If a specimen is weighed 8 times on a scale.  σ = 0.001.  The average weight is 4.1602 grams.  A 99% confidence interval for the true weight of this specimen would be?

The time until maturity of a certain variety of tomato plant normally distributed with mean µ and standard deviation σ = 2.4 days.  I select a simple random sample of four plants of this variety...

An SRS of 16 student subjects took a sensitivity to contrast after 3 hours facing into bright sun, both with and without eye grease. This is a matched pairs design. Here are the differences in sensitivity,...

The random variable X denotes the time taken for a computer link to be made between the terminal in an executive's office and the computer at a remote factory site.  It is known that X has a...

You have a four sided die with 1, 2, 3, 4 spots.  What is the sample space when we count the total sum number of spots on the bottom face for rolling the die twice (spots on the first and...

The amount of milk sold each day by a grocery store varies according to the normal distribution with mean 130 gallons and standrd deviation 12 gallons. On a randomly selected day, the probability...

Many random number generators allow users to specify the range of the random numbers to be produced.  Suppose that you specify that the rndom number Y can take any value between 0 and 2.  Then...

Association between midterm and final exam scores are linear.  The summary is midterm: mean=75, Standard deviation =10. Final: Mean =75, Standard deviation = 10. The correlation is 0.7. According...

If females of a certain species of lizard always mate with males that are 0.75 years younger than they are, what would the correlation between the ages of these male and female lizards be?  I'm...

Determine the correlation between the height and weight of 21 year old males.  If I measured the height and weight of two 21 year old men.    Male #1  Height 70, Weight 160       ...

The test scores are normally distributed with a mean of 100 and a standard deviation of 15.  If Tom's standardized score is 1.23, what was his approximate score on the test?  Round to the...

The mean test score was 850 with a standard deviation of 100.  What porportion of students had a higher score than Vivian? (Assume that test scores are normally distributed.)