Homework Help for Statistics (page 5)

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Find the indicated IQ score. The graph to the right depicts IQ scores of adults, and those scores are normally distributed with a mean of 100 and a standard deviation of 15. the shaded area is 0.8

Answered
26 Feb 2019

This is from probability 

Answered
26 Feb 2019

 

 A professor of statistics was interested in exploring a possible relation between student’s performance on the final exam (pass or fail) and their attendance at the final review session. Of the 200 students enrolled in the class, eighty attended the final review session. Sixty of the students who attended the final review passed the final exam and fifty of those who did NOT attend the review passed the final exam. Is there evidence for a difference between the two groups in terms of their performance on the final exam? 

Answered
25 Feb 2019

Construct a data set of 15 whole numbers between 5 and 20. Separate them into three equal
groups (treatment conditions) twice, once where the resulting F ratio would be significant and
once where the resulting F ratio would not be significant. Try to keep the within group variance
as similar as possible across all SIX groups. Show your work.

Answered
24 Feb 2019

Use normal approximation to determine the chance steph makes 135 or more of his 240 shots when the mean is 103.68 and standard deviation is 7.67 

Answered
22 Feb 2019

For a normal distribution with µ = 200 and s = 50, find the following values.

[Hint: Fi

Answered
20 Feb 2019

10. A lot consisting 50 bulbs is inspected by taking at random 10 bulbs and testing them. If the number of defective bulbs is at most 1, the lot is accepted; otherwise it is rejected. If there are 10 defective bulbs in the lot, what is the probability of accepting the lot?

Answered
19 Feb 2019

In a poll, 

Answered
19 Feb 2019

In a certain liberal arts college with about 10,000 students, 56% are males. If two students from this college are selected at random, what is the probability that they are of the same gender? 

Answered
17 Feb 2019

Use the given minimum and maximum data entries, and the number of classes, to find the class width, the lower class limits, and the upper class limits.

minimum=16
maximum= 126
classes = 8

Answered
16 Feb 2019

A blood bank asserts that a person with type O blood and a negative Rh factor (Rh−) can donate blood to any person with any blood type. Their data show that 49% of people have type O blood and 19% of people have Rh− factor; 52% of people have type O or Rh− factor.

  • Part (a)

    Find the probability that a person has both type O blood and the Rh− facto

Answered
15 Feb 2019

a person is asked to shuffle a standard deck of cards, draw one card, look at it, and place is back into the deck. if this procedure is repeated, find the probability of drawing the ace of spades on the 5th draw. 

Answered
15 Feb 2019

A basketball player makes 60% of his shots from the free throw line. Suppose that each of his shots can be considered independent and that he throws 4 shots. Let X = the number of shots that he makes. What is the probability that he makes 1 shot?

Answered
15 Feb 2019

Scores on an exam follow an approximately normal distribution with a mean of 76.4 and a standard deviation of 6.1. What is the minimum score you would need to be in the top 7%?

Answered
14 Feb 2019

A simple random sample of 60 items resulted in a sample mean of 80. The population standard deviation is 15 .

a. Compute the 95% confidence interval for the population mean. Round your answers to one decimal place.
(  )

b. Assume that the same sample mean was obtained from a sample of 120 items. Provide a 95% confidence interval for the population mean. Round your answers to two decimal places.
(  )

c. What is the effect of a larger sample size on the interval estimate?

Larger sample provides a  margin of error.

 

Answered
14 Feb 2019