A study conducted a few years ago claims that the adult males spend an average of 10.5 hours a week watching sports on television with a standard deviation of 4.2 hours. A recent sample of 50 adult males showed that the mean time spent per week watching sports on television is 12 hours. Test at the 1% level of significance if currently male adults spend more than 10.5 hours per week watching sports on television.

Q: A 4 year college will accept any student ranked in the top 60% of a national exam. If the test…

A: From the given information,Mean (µ) =600Standard deviation (σ) = 100Let the test score be a x which…

Q: In the​ wild, monkeys eat an average of 24 bananas a day with a standard deviation of 3 bananas. One…

A: The mean is 24 bananas a day with a standard deviation of 3 bananas. One monkey eats only 17…

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A: 68-95-99.7-rule: Let X be an observation from a normal distribution, having mean µ and standard…

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Q: The average hours of sleep on a weeknight was 6.9 hours with a standard deviation of 1.5 hours. What…

A: Given that Mean = 6.9 and Standard deviation = 1.5 Formula z = (x - mean)/ SD

Q: The incubation time for Rhode Island Red chicks has a Normal distribution with a mean of 21 days and…

A: Here, mean is 21 and standard deviation is 1

Q: The class that graduated from a college four years ago took an average of 2.3 science courses. Since…

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

Q: A study was conducted to determine the effectiveness of hypnotism on reducing pain. Using standard…

A: Sample 1(before hypnosis): n1=8x¯1=8.713s1=2.177 Sample 2(after hypnosis): n2=8x¯2=5.588s2=2.608

Q: The mean number of English courses taken in a two-year time period by male and female college…

A: Answer:-

Q: A banker finds that the number of times people use automated-teller machines (ATMs) in a year are…

A: Solution-: Given:μ=40,σ=11.2 We want to find  the proportion of customers who use ATMs between 30…

Q: (a). The null and alternative hypotheses are O Ho:ã = 2.3 Ha: + 2.3 Ο H0: μ = 2.8 На: д < 2.8 Ο Ηρ:…

A: Here given  sample statistics  And significance level 0.05

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A:

Q: The combined SAT scores for students at a local high school are normally distributed with a mean of…

A: X follows a Normal distribution with mean = 1497 and S.D = 293 Then z=(x-mean)/SD = (x-1497)/293…

Q: The average hours of sleep on a weeknight was 6.9 hours with a standard deviation of 1.5 hours. What…

A: Given Let X : The average hours of sleep on a weeknight mean = μ= 6.9  standard deviation = σ= 1.5…

Q: The results of a common standardized test used in psychology research is designed so that the…

A: Consider X be a random variable which follows normal distribution indicating the score earned on a…

Q: Happy Hair will hire only those hairdressers in the top 20 percent based on the amount of time it…

A: Given: Mean= μ== 67.5 Standard deviation= σ = 12.5

Q: The scores of students on an exam are normally distributed with a mean of 496 and a standard…

A: The mean is 496 and the standard deviation is 67.

Q: The mean number of English courses taken in a two-year time period by male and female college…

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A: GIVEN DATA, n=56x¯=8.9s=3.2claim: μ&lt;10α=0.01

Q: Rashid is 84 inches tall. If the height of males in the United States is nor- mally distributed with…

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A:

Q: The results of a common standardized test used in psychology research is designed so that the…

A: Let us define a random variable x denoting test score used in psychology research which has;…

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A: a. Consider that the mean and standard deviation of a random variable X are µ and σ, respectively.…

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A: Given,mean(μ)=70standard deviation(σ)=12

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A: Given information- Population mean, μ = 18.4 minutes Population standard deviation, σ = 2.7 minutes…

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A: We have given Mean(µ) = 40Standard deviations (σ) = 11.2X ~ N (µ, σ )= N(40, 11.2)

Q: The length of time for women’s high school volleyball games is normally distributed with a mean of…

A: Given Data Population Mean,μ = 53.0 Population Standard Deviation,σ = 6.0

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A: Given data,Mean μ=4.5sd σ=1.2P(4&lt;X&lt;6)=?

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Q: When 40 people used Weight Watchers for one year, their mean weight loss was 3.0 lbs and their…

A: The test hypotheses are given below: H0:μ=0 lbsHa:μ&gt;0 lbs From the given information, the…

Q: shoppers at the mall spend the same amount of money on average the day after Thanksgiving compared…

A: Given that    Sample sizes n1=56      , n2=43       Sample means X̄1= 145     , X̄2=123    , ?1 =46…

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A: Given that 20% of drivers don't turn signals and there are 140 cars. That is, p=0.20 and n=140

Q: A banker finds that the number of times people use automated-teller machines (ATMs) in a year are…

A: The mean is 40 and the standard deviation is 11.

Q: The results of a common standardized test used in psychology research is designed so that the…

A:

Q: The class that graduated from a college four years ago took an average of 2.3 science courses. Since…

A: Solution

Q: Assume that an intelligence test scores are distributed normallt with a mean of 100 and a standard…

A: Standard normal distribution: The standard normal distribution is a special case of normal…

Q: The average hours of sleep on a weeknight was 6.9 hours with a standard deviation of 1.5 hours. What…

A: Let, X= The number of hours of sleep on a weeknight. μ=6.9, standard deviation=σ=1.5 We want to…

Q: The combined SAT scores for the students at a local high school are normally distributed with a mean…

A:

Q: A banker finds that the number of times people use automated-teller machines (ATMs) in a year are…

A: