For each day of last year, the number of vehicles passing through a certain intersection was recorded by a city engineer. One objective of this study was to determine the percentage of days that more than 425 vehicles used the intersection. If the mean data was 375 vehicles per day and the standard deviation was 25 vehicles:         (b) more than 425 vehicles used the intersection?

Q: One year Thomas had the lowest ERA (earned-run average, mean number of runs yielded per nine innings…

A:

Q: One year Thomas had the lowest ERA​ (earned-run average, mean number of runs yielded per nine…

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

Q: The National Center for Health Statistics reports that the average systolic blood pressure for males…

A: Here, The claim to be tested is "The medical director of a large company believes the average…

Q: If the main level of snowfall for Boston Massachusetts is 44 inches per year and the standard…

A:

Q: The mean electrical energy consumption for Mr Triola’s home for the past two months is 2838 Kilowatt…

A: Given,μ=2838σ=504P(3342<X<3846)=?

Q: For a study conducted by the research department of a pharmaceutical company, 245 randomly selected…

A: Data given n1=245 , sample mean x̄1= 17.8 and s1= 4.3 n2=225, sample mean x̄2=18.2 amd s2= 3.60

Q: One year Josh had the lowest ERA (earned-run average, mean number of runs yielded per nine innings…

A: ERA- Earned-run average Josh's ERA =2.94 For males, mean ERA=4.257 standard deviation=0.664 Sally's…

Q: One year Sam had the lowest ERA (earned-run average, mean number of runs yielded per nine innings…

A: From the provided information, The mean and standard deviation for the males ERA are as follow: Mean…

Q: One year Thomas had the lowest ERA​ (earned-run average, mean number of runs yielded per nine…

A:

Q: The objectives of a study were to describe the menopausal status, menopausal symptoms, energy…

A: Given Information : The objectives of a study were to describe the menopausal status, menopausal…

Q: For each day of last year, the number of vehicles passing through a certain intersection was…

A: The engineers are recording the number of vehicles passing through a certain intersection to…

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: oretta, who turns  91  this year, has heard that the mean systolic blood pressure among the elderly…

A: Given: Sample size (n)= 19 Sample mean x¯=130 Sample standard deviation (s) = 20 Hypothesized mean…

Q: For each day of last year, the number of vehicles passing through a certain intersection was…

A:

Q: Find their respective​ z-scores. Which player had the better year relative to their​ peers, Hank or…

A: Given For males, μ=4.296σ=0.907 For females μ=3.764σ=0.866

Q: The math test scores of 16 students from one high school showed a mean of 107, with a standard…

A: There are two independent samples which are high school 1 and high school 2. We have to test whether…

Q: For woman at Hartford college, times to run 400 meters are normally distributed with a mean of 85…

A: Solution: Let X be the time to run 400 meters. From the given information, X follows normal…

Q: The mean of a test score was 21.2 and the standard deviation was 5.1 . Identify the rest scores that…

A: Given Data Mean µ= 21.2. Standard Deviation σ= 5.1. Assuming that the given data is obtained from a…

Q: Ted had the lowest ERA​ (earned-run average, mean number of runs yielded per nine innings​ pitched)…

A: According to the given information in this question We need to find the z score

Q: In a recent awards ceremony, the age of the winner for best actor was 35 and the age of the winner…

A: Actor=X , Actress=Y X=35  ,  Mean=47.3 , Standard deviation=6.4 Y=51  , Mean=38.7 , Standard…

Q: The combined math and verbal scores for students taking a national standardized examination for…

A: μ = 800 σ = 190

Q: A researcher is conducting a study to determine the mean trough dosage of medication for a…

A: From the provided information, Population standard deviation (σ) = 40 mg Margin of error (E) = 10 mg…

Q: For a study conducted by the research department of a pharmaceutical company, 245 randomly selected…

A: Given  n1=245, x̄1=17.8, s1=4.3  n2=225, x̄2=18.2, s2=3.6

Q: A study at the University of Colorado at Boulder shows that running increases the percent resting…

A:

Q: What is the z-score for this raw score?

A:

Q: A consultant wants to estimate the average income of all the baby boomers in NYC. From prior…

A:

Q: One year Chris had the lowest ERA (eamed-run average, mean number of runs yielded per nine innings…

A:

Q: In a qualifying examination for admittance to the BS Psychology. the mean score was 75 and the…

A:

Q: Loretta, who turns 91 this year, has heard that the mean systolic blood pressure among the elderly…

A:

Q: The distribution of the number of hours people spend at work per day is unimodal and symmetric with…

A: Solution-: Given: μ=8hours,σ=0.7hours We find, (a) If Saba’s z-score for his work hours was −1.3 ,…

Q: What percent of the students received a score below 64, if the mean grade on a test was 70 and the…

A:

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

A: Given Information: Population mean (u) = 165  Standard deviation (σ) = 10  Score earned by a subject…

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

A:

Q: In order to be accepted into a certain top university, applicants must score within the top 5% on…

A: The Z-score of a random variable X is defined as follows: Z = (X – µ)/σ. Here, µ and σ are the mean…

Q: if an average score of exams was 74 points for 24 students  the 25th student got 64 points whats…

A:

Q: If a student scored 77 points on a test where the mean score was 84.5 and the standard deviation was…

A: Given: Score of student(x)=77Population meanμ=84.5Population standard deviationσ=5.1

Q: The combined math and verbal scores for students taking a national standardized examination for…

A:

Q: The combined math and verbal scores for students taking a national standardized examination for…

A:

Q: Suppose the number of Covax and Pfizer vaccine bought by the Philippine government are normally…

A: Let, X=the number of vaccine μ =mean σ = sd

Q: NebNas manages the credit department for a grocery store chain in the province, and she would like…

A: Given, The null hypothesis, H0:μ=95 The alternative hypothesis, H1:μ≠95 sample size, n=100 sample…

Q: The Army reports that the distribution of head circumferences among male soldiers is approximately…

A:

Q: Loretta, who turns 91 this year, has heard that the mean systolic blood pressure among the elderly…

A: (a) The null and alternative hypothesis is; Ho: μ=120H1: μ>120 (b) Here we will be using…

Q: For each day of last year, the number of vehicles passing through a certain intersection was…

A: Given: Population mean μ=375 Population standard deviation σ=25 Let X ~ N (375, 252)

Q: For each day of last year, the number of vehicles passing through a certain intersection was…

A: The normal distribution is a symmetric bell-shaped distribution with two parameters μ and σ. mean,…

Q: The mean ACT score for 43 male high school students is 21.1 and the standard deviation is 5.0. The…

A: From the given output use the p-value to make your conclusion.

Q: According to the USDA, the mean intake of calories of males 20-39 is 2716 with a standard deviation…

A: It is given that the mean and standard deviation are 2,716 and 72.8, respectively. The sample size n…

Q: The combined math and verbal scores for students taking a national standardized examination for…

A: Given: Mean of combined scores of students = 880 Standard deviation of combined scores of students =…

Q: The board of examiners that administers the real estate broker's examination in a certain state…

A: Given data: Mean = 494 Standard deviation = 72 To find: The passing score

Q: The Ilfetimes of Brand A tires are distributed with mean 45,000 miles and standard deviation 4500…

A: Given, The Lifetimes of Brand A tires are distributed with mean 45,000 miles and standard deviation…

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.