Story Submissions What proportion of stories in this group contain between 2,000 and 2,200 words? Explain or show your roasoning. 40 35 30 25 20 15 How does the proportion of the arma you calculatod reiato to the proportion of stories in tha group that contain botween 2,000 and 2,200 words? 10 1,400 1,800 2,200 2,600 3,000 3,400 3,800 words per story
Q: Thirty-seven percent of all Americans drink bottled water more than once a week (Natural resources…
A: Z = p^ -E[p¯]σp¯~ N(0,1)
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A: Solution: From the given information, total number of part-time students is 60.
Q: Buffon's coin tosses that land head side up. Are you confident that this proportion is not 0.5? Why?
A: HERE GIVEN, n= 4040 x= no of heads occur = 2048 proportion of head = p^ = xn = 20484040 = 0.5069…
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Q: Thirty-five percent of all Americans drink bottled water more than once a week (Natural resources…
A: Solution: 1. From the given information, p=0.35 and n=290.
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Q: Thirty-three percent of all Americans drink bottled water more than once a week (Natural resources…
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Q: Part D.
A: Copy the data table onto an Excel worksheet.
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A: a. The frequency of a class or observation is the number of values corresponding to it.
Q: Thirty-three percent of all Americans drink bottled water more than once a week (Natural resources…
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A: From the given information here sample mean = 50.08 and sample Variance is 20.25
Q: Thirty-two percent of all Americans drink bottled water more than once a week (Natural resources…
A: Given: The population proportion, P = 0.32 Part a: The sample proportion, p¯ is an unbiased estimate…
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Q: Please help answering this one:
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- Stock y has a beta of 1.2 and an expected return of 11.5. Stock z has a beta of .80 and an expected return of 8.5 percentA vehicle with a particular defect in its emission control system is taken to a succession of randomly selected mechanics until r = 16 of them have correctly diagnosed the problem. Suppose that this requires diagnoses by 20 different mechanics (so there were 4 incorrect diagnoses). Let p = P(correct diagnosis), so p is the proportion of all mechanics who would correctly diagnose the problem. What is the mle of p? p̂ = Is it the same as the mle if a random sample of 20 mechanics results in 16 correct diagnoses? Explain. No, the formula for the first one is (number of failures)/(number of trials) and the formula for the second one is (number of successes)/(number of failures). No, the formula for the first one is (number of failures)/(number of trials) and the formula for the second one is (number of successes)/(number of trials). Yes, both mles are equal to the fraction (number of successes)/(number of failures). No, the formula for the first one is (number of…1. Consider the Gaussian distribution N (m, σ2).(a) Show that the pdf integrates to 1.(b) Show that the mean is m and the variance is σ.
- Researchers interested in lead exposure due to car exhaust sampled the blood of 52 police officers subjected to constant inhalation of automobile exhaust fumes while working traffic enforcement in a primarily urban environment. The blood samples of these officers had an average lead concentration of 124.32 µg/l and a SD of 37.74 µg/l; a previous study of individuals from a nearby suburb, with no history of exposure, found an average blood level concentration of 35 µg/l. Test the hypothesis that the downtown police officers have a higher lead exposure than the group in the previous study. Interpret your results in context. Based on your preceding result, without performing a calculation, would a 99% confidence interval for the average blood concentration level of police officers contain 35 µg/l? Based on your preceding result, without performing a calculation, would a 99% confidence interval for this difference contain 0? Explain why or why not.Your internal body temperature T in °F is a Gaussian (μ =98.6, σ = 0.4) random variable. In terms of the Φ function, find P[T > 100]. Does this model seem reasonable?A researcher conducts a hypothesis test using a sample of n = 20 with M = 34 and s 2 = 36 from an unknown population. What is the df value for the t statistic?
- A researcher conducts a hypothesis test using a sample of n=20 with M =34 and s^2=36 from an unknown population.What is the df value for the t statistic?Find P(R>3|R>1). thru the given exponential random variable R with rate parameter of 0.5.In single-sample, upper-tail test hypothesis test, if the researcher changes the alpha level from .05 to .10 then which statement is most true? a) a. the consequences of committing an alpha error are likely severe, all else held constant in the experiment b) b. the RR will comprise a larger area under the curve as a result, all else held constant c) c. the RR will comprise a smaller area under the curve as a result, all else held constant d) d. this image would accurately depict this change
- If the value of Cronbach’s alpha is 0.07, it means ___________; a. Research instrument is not reliable b. Research instrument is internally consistent c. Data is reliable d. Data is internally consistentA snack food manufacturer estimates that the variance of the number of grams of carbohydrates in servings of its tortilla chips is 1.33. A dietician is asked to test this claim and finds that a random sample of 24 servings has a variance of 1.37. At α=0.01, is there enough evidence to reject the manufacturer's claim? Assume the population is normally distributed. Complete parts (a) through (e) below. (a) Write the claim mathematically and identify H0 and Ha. A. H0: σ2≤1.33 (Claim) Ha: σ2>1.33 B. H0: σ2≠1.33 Ha: σ2=1.33 (Claim) C. H0: σ2≥1.33 Ha: σ2<1.33 (Claim) D. H0: σ2=1.33 (Claim) Ha: σ2≠1.33 (b) Find the critical value(s) and identify the rejection region(s). The critical value(s) is(are) enter your response here. (Round to two decimal places as needed. Use a comma to separate answers as needed.) Choose the correct statement below and fill in the corresponding answer boxes. A. The…The time X of a radioactive isotope decays with an expected value of 10 years, and is modeled as an exponential random variable. a) What is the parameter λ of the exponential RV X? b) Compute P(X < 10).