chrissy

Sam goes to the mall and records how long 100 random strangers (including men, women and children) can each hold their breath. Ken gathers 100 Olympic swimmers and records how long they can each hold their breath.

a) Who do you expect will have a higher mean? Sam or Ken? Explain.

b) Who do you expect will have a higher standard deviation? Same or Ken? Explain.

A graduate student at the University of Newport conducts a research projects about communication. She wants to know the opinions of all adult Americans regarding email vs. postal mail. She sends a survey through email to all of the 500 adults that she knows. She asks them to email the survey back to her. The survey asks for a response to this question: “Do you prefer to use email or snail mail (the U.S. Postal Service)?” She gets back 65 email responses, with 48 of them indicating a preference for email.

(a) Describe the population the student is TRYING to make conclusions about.

(b) Describe the sample she actually gets from the population.

(c) What is the sample size?

(d) Is this sample finding a mean, or is it finding a proportion? Give the mean or proportion that she found from her sample, and write a complete sentence to explain its real-world, practical meaning.

(e) List as many reasons as you can to explain why this sample may not be representative of the population.

) A radio station wants to determine how many people in the listening area support gun control laws. The station asks listeners to call in and answer the survey.

a) Explain why the sample may be biased.

b) Describe a better way to conduct the sample.

) A college wants to determine whether to renovate the gym or the science lab. The college asks you to conduct a survey. You randomly survey 30 students leaving a science club meeting.

a) Explain why the sample may be biased.

b) Describe a better way to conduct the sample.

) Stanford Binet IQ scores have a mean of 100 and a standard deviation of 16. IQ scores are roughly normally distributed.

(a) Sketch the normal curve, and label everything appropriately using the Empirical Rule, z-scores, and data values with the appropriate IQ scores.

(b) If a person's IQ has a z-score of −0.3, then explain what that tells you about how the person's IQ

compares to other people's IQ.

(c) A person has an IQ of 82. Find the z-score for this IQ score, and explain exactly what it tells you about how this person's IQ compares to other people.

(d) To have an "unusually high" IQ, a person would need to have an IQ with a z-score of 2 or more. How high would a person's IQ need to be to be considered "unusually high?" Show your work.

(e) Albert Einstein had an estimate IQ of 160. Convert Einstein’s IQ score to a z-score (show your work). What does the z-score tell us about Albert Einstein’s IQ? Is it unusual?

4) Stanford Binet IQ scores have a mean of 100 and a standard deviation of 16. IQ scores are roughly normally distributed.

(a) Sketch the normal curve, and label everything appropriately using the Empirical Rule, z-scores, and data values with the appropriate IQ scores.

(b) If a person's IQ has a z-score of −0.3, then explain what that tells you about how the person's IQ

compares to other people's IQ.

(c) A person has an IQ of 82. Find the z-score for this IQ score, and explain exactly what it tells you about how this person's IQ compares to other people.

(d) To have an "unusually high" IQ, a person would need to have an IQ with a z-score of 2 or more. How high would a person's IQ need to be to be considered "unusually high?" Show your work.

(e) Albert Einstein had an estimate IQ of 160. Convert Einstein’s IQ score to a z-score (show your work). What does the z-score tell us about Albert Einstein’s IQ? Is it unusual?

) Lengths of pregnancies are normally distributed with a mean of 268 days (which is about 9 months) and a standard deviation of 15 days.

(a) Sketch the normal curve, and label everything appropriately using the Empirical Rule, z-scores, and data values with the appropriate pregnancy lengths.

(b) What percent of women have a pregnancy that lasts less than 253 days?

(c) What percent of women have a pregnancy that lasts less than 238 days?

(d) What percent of women have a pregnancy that lasts more 313 days?

Write a complete sentence to interpret what the standard deviation of each set represents in real-world, contextual terms. Also include an explanation of how the standard deviations of the two data sets compare and what they tell us about the beauty pageant winners during the two time periods.

) Bob is moving to a new town. He looks online and learns that the mean cost of 2 bedroom houses in the town is $435,000. He also learns that the median cost of a 2 bedroom house in the town is $185,000. Bob isn't sure which "average" he should use when thinking about how much the average house costs in that area. Write an explanation to Bob explaining why it would make more sense for Bob to use the MEDIAN. Then explain why the mean housing cost would be so much higher than the median.

whats the cost to carpet the floor if carpet sells for 18 dollars a square yard. use proper conversions between the units for carpet and and the units for the floors area. how much floor space is there to cover and what will it cost. please show work im bad at math

arge cheese pizza is 14 inches in diameter and it coast 13.99 before tax.

Update: calculate the price per cubic inch for the large cheese pizza .

find the amount of pizza you get for each dollar you spend when you buy the large cheese pizza. show work and break it dowm

large cheese pizza is 14 inches in diameter and it coast 13.99 before tax.