the standard deviation of the lifetimes of a pest repeller is estimated as 100 hours, how large a sample must we take in order to be 95% confident that the error in the estimated mean lifetime will not exceed 20 hours?   A. at least 97   B. at least

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A: Note: Hi there! Thank you for posting the question. As you have posted multiple questions, as per th...

Q: Human blood is divided into 8 possible blood types. The rarest blood type is AB negative. Only 1% of...

A: Give: p = 1% = 0.01 n = 71 We used sampling distribution.  

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Q: Complete a Stem Leaf plot for the data below. Marks scored by students Math quiz 45,  58,  76,  4...

A: We have given that  Marks scored by students Math quiz 45,  58,  76,  40,  65, 76,  43,  40, 51,  53...

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Q: B. Direction: Show your solution. 1. Find the GPA of Rina (round your answer to the nearest hundredt...

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Q: A security code of four digits from digits 0 to 9 must be entered in a definite order. How many four...

A: From the information given in the question we know that, Repetition of digits is allowed The securi...

Q: Compute the margin of error of the 90% confidence level when a = 3 and n= 30

A: Given that  ?=3 , n=30 Formula for margin of error  E=Zc*?/√(n)

Q: chances that the number you formed is an even number? Ex

A: Here use counting principle and total arrangement 

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Q: You're trying to find out how many students who graduate with accounting degrees from large universi...

A: Solution: First we understand the concept of population and sample.  Population: The complete enamur...

Q: Random assignment guarantees that participant characteristics do not become a confounding variable. ...

A: Confounding variables are those that affect other variables in a way that produces distorted associa...

Q: A random sample of 750 registered voters in Phoenix is asked if they favor the use of oxygenated fue...

A:  

Q: Suppose you wanted to decrease the margin of error on your Overall Website Satisfaction metric to 0....

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Q: Sample 1 Sample 2 = 40 n2 = 50 %3D = 25.9 X2 = 22.8 o = 5.1 02=6 (a) What is the value of the test s...

A: Given that ; sample 1  n1 = 40  Mean (M1 ) = 25.9 S1 = 5.1 sample 2 n2 = 59  Mean (M2) = 22.8 S2= 6 ...

Q: Find the probability that more than 20% of the sample are from poverty-level households.

A: Given,sample size(n)=300sample proportion(p^)=0.22

Q: Sadie predicted that chimps who had just moved to a new enclosure would start to socialize more afte...

A: Since you have posted a question with multiple sub-parts, we will solve first three subparts for you...

Q: To estimate the average salary of policemen, 64 of them were taken as samples. If the mean salary of...

A: Solution

Q: Data were collected from a random sample of 220 home sales from a com- munity in 2013. Let Price den...

A: Given data  Data were collected from a random sample of 220 home sales from a com munity in 2013. Pr...

Q: researcher is interested in the average body temperature of people. We all assume that the average b...

A: We all assume that the average body temperature is 98.6°F with a standard deviation of 1.2°F. The re...

Q: Suppose IQ scores are approximately normally distributed with a mean of 100 and a standard deviation...

A: Given that, IQ scores are approximately normally distributed with a mean of 100 and a standard devia...

Q: 1)Based on the data set that has five-number summary: min=13, Q1= 55, Med= 76, Q3=85.5, Max=91 a) F...

A: (a). Range= maximum observation - minimum observation = Max- min =91-13 =78 (b). Q1= 55, so 25% valu...

Q: The average heating bill of a random sample of 6 one-bedroom apartments in Prince George last winter...

A: Let   n be the sample size X̄ be the sample mean  s sample standard deviation   

Q: Which of the following is TRUE about a between-subjects design: O A. Any factor that increases the v...

A: Between subjects design : Independent measure design It requires large number of people for study be...

Q: he manager wants to find out the mean time required to inflate a rubber raft. Assuming that the mana...

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Q: SUMMARY OUTPUT Regression Statistics Multiple R R Square Adjusted R Square Standard Error 0.713 0.50...

A: The regression equation for the given data set is given by, y=51.779+31.662x

Q: Suppose that a group of researchers is planning to test a new weight loss supplement. They have sele...

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Q: MATCHING TYPE PLEASE ANSWER WITH IN 30 MINUTES a. 0.1318 b. H0: p = 0.4, H1: p > 0.4 c. H0: p ...

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Q: The average score of boys is 60, that of girls is 70 and that of all the candidates is 64 appearing ...

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Q: A survey of randomly selected university students found that 92 of the 107 first-year students and 9...

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Q: What percentage of the students surveyed are education majors or mathematics majors?

A: We have given that the sample size 200. P( education majors) = 16% = 0.16 P( mathematics majors ) = ...

Q: In the Framingham Offspring study 4933 subjects were on anti-hypertensive medication out of 7015 tot...

A: Given,n=7015x=4933sample proportion(p^)=xnp^=49337015=0.70321-p^=1-0.7032=0.2968α=1-0.99=0.01α2=0.00...

Q: You may need to use the appropriate appendix table or technology to answer this question. Consider t...

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Q: (a) At a meeting of 15 marketing personnel, what is the probability that 10 or more are extroverts? ...

A: Here use binomial distribution in each case Finite number of trial  There are two outcomes success ...

Q: Illustration 10.21. The values of the arithmetic mean and the standard deviation of the following fr...

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Q: You are working on a magic pill that you think might totally eliminate pain when given to patients w...

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Q: Suppose that a researcher, using wage data on 250 randomly selected male workers and 280 female work...

A: Given data Suppose that a researcher, using wage data on 250 randomly selected male workers and 280 ...

Q: null and alternative hypotheses in mathematical terms as well as in words.

A: Solution-: Null and alternative hypotheses in mathematical terms as well as in words.

Q: The gym which provides the training expects the increase in enrollments in 2022 to be similar to pas...

A: Given information:          μincrease=13%σincrease=1.4%Last year's number of enrolles=80000

Q: II. IDENTIFICATION: Identify the parameter to be tested and formulate the null and altemative hypoth...

A: We have given that  Sample size n =50 Population mean μ =74 NOTE:- According to bartleby guidelines ...

Q: Shawn Spencer says the average number of homicides in New York is more than 884 per year. Adrian Mon...

A: Given n=62 Standard deviations=14.5 Mean=884

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Q: Research in third party aircraft maintenance department reported the results of an investigation int...

A: It is given that sample size (n) is 1600 and x is 8.

Q: How many soldiers should Haley sample?

A: It is given that Proportion = 79% = 0.79 Margin of error E = 0.005 Confidence level = 93% The critic...

Q: In tossing 5 coins, what is the probability of obtaining 3 tails?

A: Given : Tossing 5 coins Assuming a fair coin tossed  

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Q: 1) Determine the probability of a random applicant getting automatically rejected. 2) If 6 applicant...

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Q: create a frequency distribution table using this formula 2, 4, 4, 4, 4, 5, 5, 5, 6, 6, 7, 7, 8, 8, 8...

A: Frequency Distribution: One particularly useful tool in grouping the data is the frequency distribut...