he mean age when smokers first start is 13 years old with a population standard deviation of 1.8 years. A researcher thinks that smoking age has significantly changed since the invention of ENDS—electronic nicotine delivery systems. A survey of smokers of this generation was done to see if the mean age has changed. The sample of 33 smokers found that their mean starting age was 12.3 years old. Do the data support the claim at the 1% significance level? What are the correct hypotheses? H0:                    years H1:                    years Based on the hypotheses, find the following: Test Statistic z =  (Give answer to at least 4 decimal places)

Q: Based on the hypotheses, find the following: Test Statistic z =    ?   (Round to 4 decimal places.)…

A: Given : sample size, n = 32 sample mean, x̄ = 12.3 population standard…

Q: The Pew Internet and American Life Project surveyed 2227 adults in 2011, asking them about their…

A: It is given that the mean number of text messages sent per day is 40.9 for men, 42.0 for women. The…

Q: c. Find the p-value. Round to 4 decimals. p-value = d. Make a decision. O Fail to reject the null…

A: Given : Mean : x1 = 46.9x2 = 36.2 standard deviation : σ1 = 12.4σ2 = 15.3 Sample size : n1 = 124n2 =…

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A: The provided data is,

Q: Please also explain why you determined whether or not the results are statistically significant.…

A: Given information isn1=40n2=40s1=0.50

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A: According to the given information in this question We need to find the value of standard error

Q: An article in the Register stated that students in the state university system take 4.5 years, on…

A: Givensample size(n)=49Mean(x)=5.1standard deviation(s)=1.2significance level(α)=0.01

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A: Solution

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A: Obtain the mean number of movie-goers that prefer horror movie genre. The mean number of movie-goers…

Q: Do the data support your claim at the 1% level?

A: The summary of the statistics is, The type of test is right tailed test

Q: The admission committee of AUCA passes 61% of those who took the exam. If the scores follow a normal…

A: We have given that.   X~N( μ , ?^2 )   μ =350 , ? =25   Z-score =( x - μ )/?

Q: Psychological and educational tests, including MMPI are often designed so they have a mean of 50 and…

A: Given that  They have a mean of 50 and a standard deviation of 10.

Q: A researcher collected data from Boston police officers and found that on average they spent 14.3…

A: From the provided information, Mean (µ) = 14.3 Standard deviation (σ) = 3.2

Q: The scores of students in a 40-point Mathematics achievement test are normally distributed with  a…

A: given data normal distributionσ = 3.595% of students got score between 28 and 42.mean = ?

Q: The test statistic is The p-value is Should the null hypothesis be rejected?

A: here from given information  for gamer in age- group 16-25 x1¯ = 42.5 σ1 = 9.5 n1 = 351    for gamer…

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A:

Q: An economist would like to estimate the mean amount of money that a family spends to within $45. If…

A: GivenMargin of Error(E)-45standard deviation(σ)=190α=1-0.93=0.07α2=0.035zα2=1.8119      (from z…

Q: Psychological and educational tests, including MMPI are often designed so they have a mean of 50 and…

A: Given: Mean μ=50 Standard deviation σ=10

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

Q: Suppose the average golfer drives the ball around 259.1 yards with a standard deviation of 9.73.…

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Q: If the heights of intramural college basketball players are normally distributed with mean u =…

A: Given,μ=70σ=6.5P(63.5<X<76.5)=?

Q: The National Center for Health Statistics reported that the mean total cholesterol level in 2002 for…

A:

Q: For 100 randomly selected adults, compute the mean and standard deviation?

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A:

Q: Nationally the average score on the college entrance exams (Verbal test) is 453 with a standard…

A: Consider that μ is the population mean score. Null hypothesis: H0: μ = 453. Alternative hypothesis:…

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A: The scores on the admission test are normally distributed with a mean score of 146 and a standard…

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A:

Q: Find a 90% interval estimate of the mean daily time spent on rigorous exercise by all employees.

A: From a random sample of 25 employees, the mean time spent on vigorous daily exercise was 28.5…

Q: Do students who are members of fraternities or sororities have GPAS alfferent from the student body…

A: μ=2.59,s=0.34,x¯=2.47,n=123Decision rule: When p value< level of signicance,then reject the null…

Q: Fran is training for her first marathon, and she wants to know if there is a significant difference…

A: Given data,n1=40x1=46.6σ1=4.6n2=45x2=48.8σ2=2.4Compute value of test statistic?

Q: The National Center for Health Statistics reports that the LDL cholesterol for adults has a mean of…

A: Sample size n=23 Sample mean=144.3 Population standard deviation =40

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A: Let X be the random variable representing the cost per participant. Then, X~N(μ,σ2),where…

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A: Given : Let X be a r.v  with Mean (μ) = 100 Standard deviation (σ) = 15

Q: An article in the San Jose Mercury Newsstated that students in the California state university…

A:

Q: A researcher gathered data on five randomly selected individuals from a data set. The ages are 25,…

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A: Let X be the length of the pup.Given that, X follows a normal distribution with mean of µ=29.5…

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A: Given that  Population standard deviation =200 Margin of error =E =36 91% confidence.

Q: A Statistics instructor wanted to compare the scores on the same final exam given to students at a…

A: We have given that  Sample sizes n1= 36 , n2= 45 ,xbar1=84 ,xbar2= 79 , s1= 3.4 ,s2=2.6  Confidence…

Q: 4. A surgeon is experimenting with a new technique for implanting artificial blood vessels. Using…

A: GivenMean(μ)=32.5standard deviation(σ)=2.6

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Q: A shareholders' group is lodging a protest against your company. The shareholders group claimed that…

A: As the population standard deviation is not known, we will use t-distribution. The test statistic…

Q: The serum cholesterol levels for men in one age group are normally distributed with a mean of 178.1…

A: Given that the serum cholesterol levels for men in one age group are normally distributed with a…