Answers only: intro statistics

CHAPTER 974. A particular brand of tires claims that its deluxe tire averages at least 50,000 miles before it needs to be replaced. From past studies of this tire, the standard deviation is known to be 8,000. A survey of owners of that tire design is conducted. From the 28 tires surveyed, the mean lifespan was 46,500 miles with a standard deviation of 9,800 miles. Using alpha = 0.05, is the data highly inconsistent with the claim?Chapter 1080. At Rachel’s 11th birthday party, eight girls were timed to see how long (in seconds) they could hold their breath in a relaxed position. After a two-minute rest, they timed themselves while jumping. The girls thought that the mean difference between their jumping and relaxed times would be zero. Test their hypothesis.Relaxed time (seconds) Jumping time (seconds)26                                              2147                                              4030                                                2822                                                 2182.  Marketing companies have collected data implying that teenage girls use more ring tones on their cellular phones than teenage boys do. In one particular study of 40 randomly chosen teenage girls and boys (20 of each) with cellular phones, the mean number of ring tones for the girls was 3.2 with a standard deviation of 1.5. The mean for the boys was 1.7 with a standard deviation of 0.8. Conduct a hypothesis test to determine if the means are approximately the same or if the girls’ mean is higher than the boys’ mean.90. Researchers interviewed street prostitutes in Canada and the United States. The mean age of the 100 Canadian prostitutes upon entering prostitution was 18 with a standard deviation of six. The mean age of the 130 United States prostitutes upon entering prostitution was 20 with a standard deviation of eight. Is the mean age of entering prostitution in Canada lower than the mean age in the United States? Test at a 1% significance level.120.  A golf instructor is interested in determining if her new technique for improving players’ golf scores is effective. She takes four new students. She records their 18-hole scores before learning the technique and then after having taken her class. She conducts a hypothesis test. The data are as follows.Player 1 Player 2 Player 3 Player 4Mean score before class 83            78             93              87Mean score after class    80            80             86             86The correct decision is:a. Reject H0.b. Do not reject the H0CAHPTER 12:8. Participants threw darts at a target. In one condition, they used their preferred hand; in the other condition, they used their other hand. All subjects performed in both conditions (the order of conditions was counterbalanced). Their scores are shown below.Preferred Non-preferred12                     77                          911                       813                     1010                        9a. Which kind of t-test should be used?b. Calculate the two-tailed t and p values using this t test.c. Calculate the one-tailed t and p values using this t test.12. If you have 5 groups in your study, why shouldn’t you just compute a t test of each group mean with each other group mean?CHAPTER 13:4. What does the standard error of the estimate measure? What is the formula for the standard error of the estimate?

 
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Two question about Math 45

Problem set1 and 4

 
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Math Real Analysis 2

decide if it is absolutely convergent, convergent or divergent

 
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statistics problems

1.         It is estimated that 27% of all California adults are college graduates and that 31% of California adults are regular internet users. It is also estimated that 21% of California adults are both college graduates and regular internet users.(a) Among California adults, what is the probability that a randomly chosen internet user is a college graduate? Round your answer to 2decimal places.(b) What is the probability that a California adult is an internet user, given that he or she is a college graduate? Round your answer to 2 decimal places.2. A soft drink company has recently received customer complaints about its one-liter-sized soft drink products. Customers have been claiming that the one-liter-sized products contain less than one liter of soft drink. The company has decided to investigate the problem. According to the company records, when there is no malfunctioning in the beverage dispensing unit, the bottles contain 1.01liters of beverage on average, with a standard deviation of 0.14liters. A sample of 70bottles has been taken to be measured from the beverage dispensing lot. The mean amount of beverage in these 70bottles was 0.995liters. Find the probability of observing a sample mean of 0.995liters or less in a sample of 70bottles, if the beverage dispensing unit functions properly.Carry your intermediate computations to at least four decimal places. Round your answer to at least three decimal places.3. An existing inventory for a test measuring self-esteem indicates that the scores have a standard deviation of 8 . A psychologist gave the self-esteem test to a random sample of 70individuals, and their mean score was 68 . Construct a 95%confidence interval for the true mean of all test scores. Then complete the table below.Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place.This goes with question 3What is the lower limit of the 95% confidence interval?What is the upper limit of the 95% confidence interval?4. Use the calculator provided to solve the following problems.Consider a t distribution with 15degrees of freedom. Compute P(t > 1.33). Round your answer to at least three decimal places.Consider a t distribution with 18degrees of freedom. Find the value of c such thatP(-cc) = 0.1. Round your answer to at least two decimal places.

 
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midpoint/distance

Find the coordinates of the midpoint of the line segment that joins the two given points.(x, y) = (−8, −6) and (x, y) = (−5, −3)

 
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Week 6,7,8

Answer Each Weeks Discussion minimum of 200 words

 
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start at 5 create a pattern that multiplies each number by three and subtracts 2 dont stop until you get…

start at 5 create a pattern that multiplies each number by three and subtracts 2 dont stop until you get to five

 
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Disaster Recovery

Please write in about 200 words in APA format with in-text citation for below questions.1) Define and describe disaster recovery. ( 50 words)2) Compare and contrast a web page and a web service. ( 50 words)3) Define and discuss vendor lock-in and identify steps a company should take to mitigate this risk. ( 50 words)4) Discuss why a company should consider using a consultant to oversee a cloud migration and list specific skills you would expect the consultant to have. ( 50 words)Note: You are required to use at least two-peer reviewed sources (besides textbook) to answer the above questions.

 
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MAT230 D7

1 page no apa formatclass will be Statistics MAT 220Access thecourse catalogand review the description of the course(s) you have registered to take for next mod. The undergraduate course catalog begins around page 220, depending on the version you are using.Post a response to the appropriate prompt(s) below:If you will be taking a course in your major, discuss how you anticipate that this course will contribute to your knowledge base and career preparation.  Consider doing research to find an article that supports your statements.If you will be taking a general education course, discuss the benefits of a broad knowledge base beyond your major topic of study.  Cite reference(s) that support your statements.If you will be taking an elective, discuss why you find the course interesting.If you will be graduating upon completion of this course, congratulations!  Please discuss how you will use your degree to further your career.

 
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finite math

need help with finite math homework

 
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