A survey of graduate students across Oman found that average salary for a graduate student is 2000 R.O. Further the survey was done after some years taking a sample of 97 graduates to check whether the net salary figure changed or not . Assume the standard deviation to be 500 and average salary of the graduate to be 1700.Conduct the hypothesis test to know whether the income of graduates changed or remain the same at 5% level of significance. Explain the concept of suitable test undertaken for the same.

Q: There's a claim that the average tuition fee in a private university for a year in the Philippines…

A: Solution To test the hypothesis we will use z distribution.

Q: Suppose that IQ scores have a bell-shaped distribution with a mean of 103 and a standard deviation…

A:

Q: The Wechsler IQ test is normally distributed with mean 100 points and standard deviation 15 points.…

A: GivenMean(μ)=100standard deviation(σ)=15Bill Gates was found to have an IQ of 160 on the Wechsler IQ…

Q: find an 80th percentile of the distribution of the average of 49 flyballs

A: Let M denote the average distance of fly balls for the sample of size n = 49.

Q: Blood glucose levels for overweight tweens, adolescents between the age 9-12, have a mean of 100…

A: A hypothesis test can be conducted to test whether the population mean is equal to the claimed value…

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

A:

Q: he retirement age of National Football League (NFL) players is Normally distributed with a mean of…

A:

Q: A national study found that college students with jobs worked an average of 24 hours per week. The…

A: The mean is The standard deviation is .

Q: A marketing firm wants to estimate the difference in the mean amount of caffeine in two brands of…

A:

Q: An IQ test has a mean of 97 and standard deviation of 10. Which is more unusual, an IQ of 87 or an…

A: Given data  μ = 97σ = 10which score is more unusual? 87 or 110?

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

A: Given Sample=30 Mean=12.2 Standard deviation=2 Significance level=0.01

Q: The average production of peanuts in Virginia is 3000 pounds per acre. A new plant food has been…

A: The unit of interest is the singular observation which used to study the data set. Variable of…

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

A: Given,Mean μ = 13Standard deviation σ = 2Sample size n = 35Sample mean x¯ = 12.4

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

A: To find the percentage of IQ scores that are at least 52 using the empirical rule, we first need to…

Q: A market research firm reported that the mean annual earnings of all family practitioners in the…

A: From the provided information, Sample size (n) = 38 Sample mean (x̄) = 198513 Sample standard…

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

A: Given,mean(μ)=170standard deviation(σ)=10A raw score(X)=198

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 height of men is a normally distributed variable with a mean of 68 inches and a standard…

A: Mean(μ)=68Standard deviation(σ)=3

Q: The mean age of 95 teachers in a school is 36 years with a standard deviation of 4.6. Mr.Data is 28…

A: The z-score is -1.74.The percentage of ages that is younger than Ms. Management is…

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: Can you conclude the mean price in 2013 is greater than the mean price in 2012?

A: Sample size is n = 70 Sample mean = 295 And population SD = 148 Test is that whether  the mean price…

Q: A test had 12 items. A new version of a test was made by adding a set of 12 items which resembles…

A: “Since you have asked multiple questions, we will solve the first question for you. If you want any…

Q: A random sample of 84 products is selected and sample mean and standart deviation are found to be…

A: We have to find level of confidence.

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

A: Given Data; x¯=165σ=50x=145

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: 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;…

Q: Assume the life span of a battery pack for a popular toy is know to be Normally distributed with a…

A: Solution: Let X be the life span of a battery pack for a popular toy. From the given information, X…

Q: The test scores of students in a class test has a mean of 70 and with a standard deviation of 12.…

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

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

A: Given:

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

A: Formula for z-score is,

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

A: In order to test the claim that the smoking age has significantly changed from 13 years, conduct a…

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

A:

Q: The sample mean weight of 65 adult African elephants was measured to be 14,325.62 pounds, with a…

A: Solution : Given :  n= 65, X¯ = 14325.62 pounds, σ = 872.71 pounds , α = 0.10 Let us define , H0 : μ…

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

A: Solution-: Given: μ0=13, σ=2, x¯=12.3, n=34, α=0.01=1% We want to find, (a) Null and alternative…

Q: Assume that adults have iq scores that are normally distributed with a mean of 97.9 and a standard…

A:

Q: A survey found that women's heights are normally distributed with mean 62.3 inches and standard…

A: Mean(μ)=62.3Standard deviation(σ)=2.2

Q: An advertising agency that serves a job radio station wants to estimate the mean amount of time that…

A: Here, σ=45, confidence level=90%, E=5.

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

A:

Q: A survey found that women's heights are normally distributed with mean 62.3 inches and standard…

A: Mean(μ)=62.3standard deviation(σ)=2.2Live characters employes at an amusement park have height…

Q: An exam score has a mean of 504 and standard deviation of 90.  What exam score coresponds to a…

A: given data, An exam score has a mean of 504μ=504standard deviation of 90.σ=90  exam score(x)…

Q: Raul received a score of 77 on a history test for which the class mean was 70 with a standard…

A: Define History as H and biology as B. Given: H=77μH=70σH=9B=75μB=70σB=4