Researchers collected a simple random sample of the times that it took 81 college students to earn their bachelor’s degrees.  The sample mean was 4.8 years with a standard deviation of 2.2 years. (National Center for Education Statistics, 2008) Use a significance level of 0.05 to test the claim that the mean time for college students to complete their bachelor’s degrees is more than 4.5 years.

Q: Suppose that shoe sizes of American women have a bell-shaped distribution with a mean of 8.21 and a…

A: X~N( μ , ?)   μ=8.21 , ?=1.48   Z-score =( x - μ )/?

Q: Suppose that shoe sizes of American women have a bell-shaped distribution with a mean of 8.11 and a…

A: Consider,X be a random variable that represents the shoe size of American women that has a…

Q: Suppose that shoe sizes of American women have a bell shaped distribution with a mean of 8.04 and a…

A: Given that  Mean = 8.04 , Standard deviation = 1.53

Q: The mean age when smokers first start is 13 years old with a population standard deviation of 1.9…

A: Givenn=31x=12.2σ=1.9α=0.10

Q: If the mean time spent doing this homework assignment was 47.3 minutes with a standard deviation of…

A: Mean = 47.3 Standard deviation = 5.8

Q: The mean age when smokers first start is 13 years old with a population standard deviation of 1.8…

A: Given ,  Population mean = μ = 13 years Population standard deviation = σ = 1.8 years Sample size =…

Q: Explain, the significance level that you accept this sample taken from a student population with an…

A: Here Use t test of single sample Mean Because population standard deviation unknown  P value from t…

Q: what is the minimum accepted score

A:

Q: Suppose that shoe sizes of american women have a bell shaped distribution with a mean of 8.42 and a…

A:

Q: The mean age when smokers first start is 13 years old with a population standard deviation of 2…

A: Given that  Sample size n =31 Sample mean =12.1 Population standard deviation =2

Q: What percentage of organs weighs less than 250 grams or more than 350 grams in a bell-shaped…

A: mean=μ=300, σ=sd=50X~N(300, 50)P(X<250or X>350)=?

Q: Thanks to an initiative to recruit top students, an administrator at a college claims that this…

A:

Q: hello, can you please explan with details? Thanks!

A: a)Hₒ: μ = 93Hₐ: μ < 93The null hypothesis states that the true population mean time on Tiktok is…

Q: The mean age when smokers first start is 13 years old with a population standard deviation of 2…

A: The hypotheses for the test is given below.Null hypothesis:H0: µ = 13Alternative hypothesis:H1: µ ≠…

Q: Suppose that IQ scores have a bell-shaped distribution with a mean of 100 and a standard deviation…

A:

Q: The mean age when smokers first start is 13 years old with a population standard deviation of 1.8…

A: Hypothesis: Null hypothesis: H0: μ=13Alternative hypothesis: H1: μ≠13 The test statistic is obtained…

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: Suppose that IQ scores have a bell-shaped distribution with a mean of 100100 and a standard…

A: percentage of values greater than 145 = 0.15%  Explanation:Step 1: Define what the empirical rule…

Q: The mean age when smokers first start is 13 years old with a population standard deviation of 1.8…

A: It is given that the sample size of smokers is 34and their first starting age is 12.2 years old. The…

Q: Suppose that shoe sizes of American women have a bell-shaped distribution with a mean of 8.338.33…

A: Given: Mean,  μ = 8.33 Standard deviation, σ = 1.48 Concept: The empirical rule states that:…

Q: Professor Zihni Sinir has 184 students in his college mathematics lecture class. The scores on the…

A: Given: Mean, μ=72.3, Standard deviation, σ=8.9, also the scores are normally distributed.To find,…

Q: Most medical schools of require applicants for admission to take the Medical College Admissions Test…

A: Given : Scores on the MCAT are roughly normally distributed with a mean of 500 and a standard…

Q: If the average wait time is 12 minutes with a standard deviation of 3 minutes, determine the…

A: Given : Average wait time =12 minutes Standard deviation =3 minutes We have to calculate percentage…

Q: Suppose that shoe sizes of American women have a bell-shaped distribution with a mean of 8.358.35…

A: The provided information are: Population mean (µ) = 8.35 Population standard deviation (σ) = 1.46

Q: It appears that people who are mildly obese are less active than leaner people. One study looked at…

A: The central limit theorem explains that the sampling distribution of means () follows the…

Q: There were over 3.5 million hospital discharges in the year 2000 in the U.S. state of California.…

A: From the given data Median = 3.0 Mean = 4.6 Standard Deviation =4.5 are the descriptive statistics…

Q: Using the empirical rule, what percentage of American women have shoe sizes that are no more than…

A: It is given that Mean, μ = 8.33Standard deviation, σ = 1.5

Q: Suppose that IQ scores have a bell-shaped distribution with a mean of 103103 and a standard…

A: The percentage of IQ scores at least 58 is approximately 32%.Explanation:The empirical rule (also…

Q: Most medical schools of require applicants for admission to take the Medical College Admissions Test…

A: A student will be admitted if he/she is in the top 10%, which means that the student must be having…

Q: scores are used as part of the admissions process for more than 60006000 graduate management…

A: *1 As Given:-   The null and alternative hypotheses are ?0:?=563 versus ??:?<563.…

Q: Suppose height of men in the US is normally distributed with mean 70 inches and standard deviation 3…

A: The middle 95% of sample means based on 10 randomly selected mean to fall is obtained below: From…

Q: It appears that people who are mildly obese are less active than leaner people. One study looked at…

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

Q: "Domestic cats kill many more wild birds in the United States than scientists thought," states a…

A:

Q: Suppose that grade point averages of undergraduate students at one university have a bell-shaped…

A: Empirical rule: The probability that the observation under the normal curve lies within 1 standard…

Q: Most medical schools of require applicants for admission to take the Medical College Admissions Test…

A: Obtain the Z-score for the random variable X equals 481. The Z-score for the random variable X…

Q: What is the probability that the mean number of minutes of daily activity of the 66 mildly obese…

A: Given: Mean no. of minutes of daily activity of mildly obese people, μ1=365sd of of daily activity…

Q: The mean age when smokers first start is 13 years old with a population standard deviation of 1.8…

A:

Q: The total snowfall per year is normally distributed with mean 99 inches and standard deviation 14…

A: The 68-95-99.7% (Empirical) Rule: For a normal distribution, the empirical rule (68-95-99.7% Rule)…

Q: Most medical schools of require applicants for admission to take the Medical College Admissions Test…

A: Given that, Mean, mu= 500 Standard deviation, sigma= 10.6 We know that Z score=(X-mu)/sigma