4. Which of the following is the strongest correlation? 78 b. .00 c. 1.67 e. No way to tell without the mean of the two distributions. 5-7. What is the direction of the following correlations no relationship) a. IQ and shoe size b. reading skills and the amount of television.
4. The yield of corn in a one-acre plot follows a normal distribution with a mean ? = 6.75 tons and a standard deviation ? = 0.25 tons. (5 pts each)
(a) What is the probability that a randomly chosen one-acre plot will have a yield of.
400: HW 6 and Given: 17 .05 1 tail alpha Very few alternative tails Hyp obtained 3 tails value P-Null 0.5 P-Real 6a) Significance 6b) Critical Value 6c) Power 6d) Reject the Null? O Yes O No
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4.) You play a game with your friend in which you alternate flipping a weighted coin, which comes up heads with probability 1 25 . You flip the coin first. The player who flips a heads first wins the game. a.) What is the probability that you win the game?.
5. Identify the given random variable as being discrete or continuous. The cost of a randomly selected orange.
Continuous.
Discrete.
6. Suppose that random guesses are made for 5 questions on a multiple-choice test (n = 5). Suppose that there are.
4.15. A cutting tool wears out with a time to failure that is normally distributed with a mean of 10 working days and a standard deviation of 2.5 days. (a) Determine its design life for a reliability of 0.99. (b) Find the reliability if the tool is replaced every (i.
40% of employees are female and 60% of employees are male. Suppose 60% of the male workers are married and 40% of the femalr workers are married. What is the probability that a married worker is male?.
42% of postmenopausal women have low bone density (osteopenia), placing them at risk for osteoporosis with ensuing spontaneous fractures. Osteoporosis is estimated to cost $14 billion per year in medical expenses alone, and yet it can be prevented if treated early enough. A physicians group has 250 postmenopausal primary patients.
400 people were asked whether gun laws should be more stringent. 300 said "yes" and 100 said "no." the point estimate of the Standard deviation of the proportion in the population who will respond "yes" is.
.
40118 (1 complete) This Te COLLEGE Find the area of the indicated region under the standard normal curve. of the standard normal table Click here to view page 2 of the standard normal table. OTES The area between z 08 and z = 1 under the standard normal curve is.
4. The price of a share of stock divided by a companys estimated future earnings per share is called the PE ratio. High PE ratios usually indicate "value' stocks or bargain stocks. A random sample of 51 of the largest companies in the United states gave the PE ratios listed.
42.
Select one:
A. LCL=85 UCL=95
B. LCL=74 UCL=86
C. LCL=80 UCL=110
D. LCL=20 UCL=170
44.An electric company operates a fleet of trucks that provide electrical service to the construction industry. Monthly.
4.4.12. Let Yi Y2 Y be the order statistics of a random sample of size 3 from a distribution having the pdf f(z) 32a, 0 a 1, zero elsewhere. Show that Z1 Y1/Y2, Z2 Y2/Y3, and Z Y3 are mutually independent
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42. What does a coefficient of correlation of 0.70 infer? A) Almost no correlation because 0.70 is close to 1.0 B) 70% of the variation in one variable is explained by the other C) Coefficient of determination is 0.49 D) Coefficient of nondetermination is 0.30 E) None of the above
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4. Toss a coin 10 times and record the number of heads by a single tally below.
5. Repeat the last step 30 times (you can toss 10 coins at once). Once you are finished, calculate total frequency, relative frequency and percent frequency for each outcome. Outcome.
4. Two popular dietary supplements are being compared on the basis of speed of absorption by the large intestines. Specifically, supplement B is claimed to be absorbed more than three times as fast as supplement A. Let HA and AB denote the mean absorption times of supplement A and B,.
42 people attended a holiday event. 26 of the attendees ate a piece of cake. 14 of the attendees ate a piece of pie. 32 of the attendees ate a piece of cake or a piece of pie (or both). How many of the attendees ate both a piece of.
4-24 Use the data in Problem 4-22 and develop a regression model to predict selling price based on the square footage, number of bedrooms, and age. Use this to predict the selling price of a 10-year-old, 2,000-square -foot house with three bedrooms.
4-22:
Below.
4. The noise voltage in an electric circuit follows a Gaussian distribution with mean equal to zero and variance equal to 10 (a) [10 points Find the probability that the value of the noise exceeds 10-4 (b) [10 points Given that the value of the noise is positive, calculate the.
4.8. (Example of a nonnormal bivariate distribution with normal marginals) Let X1 be N(0, 1), and let X2 = { Show each of the following. (a) X2 also has an N(0, 1) distribution. (b) X1 and X2 do not have a bivariate normal distribution Hint: (a) Since which is a.
4.2.23 Question Help In a survey of 1015 adults, it was reported that almost 60% of all people said the tax code is unfair, whereas slightly more than 60% of those making more than $50,000 viewed the code as unfair. Suppose that the contingency table to the right represents the.
40% of women between the ages of 25 and 29 are not married. In a random survey of 10 women in this age group, find the probability that at most 5 were married.
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40. Compute the sample median, 25% trimmed mean, 10% trimmed mean, and sample mean for the lifetime data given in Exercise 27, and compare these measures..
(4.51 S-AQ) For a biology project, you measure the weight in grams and the tail length in millimeters of a group of mice. The correlation is r = 0.5. If you had measured tail length in centimeters instead of millimeters, what would be the correlation? (There are 10 millimeters in.
400 patients are enrolled in a study to evaluate the accuracy of a test for diabetes disease. 200 of the patients were diagnosed with diabetes. 160 of the patients with diabetes had a positive test as did 10 of the patients without diabetes. What is the probability (i.e., PPV) that.
4. Use the values in the table below, which represent the heights, in inches, of 36 randomly-selected students enrolled in BMGT 230, this semester, to answer/complete Parts a through c: 68 72 62 70 70 72 70 697 6471 68 62 65 65 63 67 62 64 67 63 70.
4. The time required to complete a project is normally distributed with a mean of 77 weeks and a standard deviation of 4 weeks. The construction company must pay a penalty if the project is not finished by the due date of the contract. If a construction company bidding on.
4.2 B
QUESTION 1/3: In your own words, explain the following:
a) why would a social researcher use a chi-square test?
b) what does it mean to say that two variables are "statistically independent?"
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41. Allegiant Airlines charges a mean base fare of $89. In addition, the airline charges for making a reservation on its website, checking bags, and inflight beverages. These additional charges average $39 per passenger (Bloomberg October 8-14, 2012). Suppose sample of 60 passengers is taken to determine the total cost.
4. You estimate the variance from a random sample and find s 25. If you were to multiply each of the raw data points by 5, what would be the resulting standard deviation based upon the newly transformed data? (2 marks)?
.
40) The following data summerize the results from an independent -measures study camparing three treatment conditions.
Treatment
I II III
4 3 8 N=12
3 1 4 G=48
5 3 .
4.4.3. Is the following set of data likely to have come from the geometric pdf pX (k) = (3 /4 )^(k1) · (1/ 4) , k = 1, 2,...? Explain.
2812251283
5424722847
2623513325
4223636493
3751343462
.
427 of 1007 respondents said it would hurt civic life a lot.
The 95 percentage is wider. To get a higher degree of certainty, the interval needs to be widened. The 95 percentage is wider. To get a higher degree of certainty, the interval needs to be.
4. We roll a fair die repeatedly until we see the number four appear and then we stop.
(a) Describe a sample space and a probability measure P to model this situation. (b) Calculate the probability that the number four never appears. (c) Let A be the.
40. Affirmative Action A sociologist wishes to conduct a pol to estimate the percentage of Americans who favor affirmatie action programs for women and minorities for admission to colleges and universities. What sample size should be obtainel if she wishes the estimate to be within 4 percentage points an 90%.
4. The US. Department of Labor is interested in estimating the proportion of women in the workforce in the state of Washington. They randomly select 525 employment records from the state, and find that 229 of the people are female. Do the data provide strong evidence that less than half.
4,000 women working in a factory were recruited into a study in 1940. Half of the women worked in manufacturing and halt in administrative offices. The incidence of bone cancer through 1970 among the 2,000 women working in manufacturing was compared with that of 2,000 women working in administrative offices..
4.4.1. Because of her past convictions for mail fraud and forgery, Jody has a 30% chance each year of having her tax returns audited. What is the probability that she will escape detection for at least three years? Assume that she exaggerates, distorts, misrepresents, lies, and cheats every year.
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42. The value of Young s modulus (GPa) was deter-mined for cast plates consisting of certain inter-metallic substrates, resulting in the following sample observations ( Strength and Modulus of a Molybdenum-CoatedTi-25Al-10Nb-3U-1MoInter-metallic, J. Mater. Engrg. Perform., 1997: 46—50):
116.4 115.9 114.6 115.2 115.8
a. Calculate.
42. For various reasons, researchers often want to know the number of people who have participated in embarassing activities such as illegal drug use, cheating on tests,
robbing banks, etc. An opinion poll which asks these questions directly is likely to elicit many untruthful answers. To get.
4. The qualified applicant pool for six management trainee positions consists of eight women and four men. How many different groups of applicants can be selected for the positions?
.
4.21
The dual probe precision Digital Therometer is used to measure the temperature of any liquid solution. The difference between the true temperature and the measured temperature is a normally distributed random bariable with a mean p
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10. Two events A and B are __________ if they cannot occur at the same time (that is, their Venn diagrams do not overlap).
A. Disjoint
B. Mutually Exclusive
C. Compound
D. All of the Above
.
4. Your grandfather gave you his lucky coin. You want to test if it's a fair coin, so you will flip it 20 times are record the results. Your null hypothesis that the coin is fair, and you will accept this hypothesis if you the number of heads is between.
4. Wage = 0 + 1female + 2education + 3age (predicted equation with ^)
- Set up the null and alternative hypothesis to test the effects of education is the same as the effects of age.
- How will you test this use t-statistics.
4. The number of car accidents in Bethlehem on a rainy day is a variable with 5 and on a dry day is a Poisson random variable with a mean of 2. Let X denote the number of traffic accidents tomorrow The probability that tomorrow is a rainy day is.
(4.1) We will use the letters a; b; c; d; e; f to form words of length 4. Letters cannot be repeated.
(a) How many words can be made?
(b) How many words end in ef?
(c) How many words contain.
4.Determine type of sampling used 1.a) I collected shoe sizes from my family 2.b) 1003 adults were called after their phone numbers were randomly generated by computer 3.Police stopped every sixth driver for sobriety test 4.d) U.S.D.O.C. collected data by randomly selecting 8 Federal prisons and surveying every prisoner
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4. The normal range for cholesterol for an adult is 120 -240mg/dl. A study found that the total cholesterol level for American adults has a mean of 159.2mg/dl and 84.1 of adults have a cholesterol level below 200mg/dl. Assuming that cholesterol level is normally distributed; Determine the standard deviation of.
