According to the norms established for a history test, Grade 8 students should have an average of 81.7 with standard deviation of 8.5. If 100 randomly selected grade 8 students from a certain school district average 79.6 in this test, can we conclude that at 0.05 level of significance that Grade 8 students from this school district can be expected to have a different average than the norm of 81.7?

Q: e in the upper 2.5% of admission test scores in order to qualify for a very competitive nursing…

A: The z score can be calculated as: z=x-μσ The required z score that is associated with the top 2.5%…

Q: If a sample has a mean of 150 and a standard deviation of 9, what is the value in the data set that…

A: Given,mean(μ)=150standard deviation(σ)=9Z-score=1.58

Q: Assume a researcher recruits 150 African American and Caucasian individuals taking warfarin to…

A: Given: n1 = 75 X1 = 6.1 S1 = 1.7 n2 = 75 X2 = 4.3 S2 = 0.9 Sp = 1.10 Formula Used: Sp =…

Q: Walleyes found in lake Windermere have a mean length of 18.4 inches with a standard deviation of 4.2…

A:

Q: According to a recent survey, the population distribution of number of years of  education for…

A: What is the standard error of mean?

Q: A study was made of a sample of 25 records of patients seen at a chronic disease hospital on an…

A: Given data : Sample size = 25 Sample mean = 4.8 Sample standard deviation = 2 Population mean = 4…

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

A: Given  mean of 670 and a standard deviation of 220.

Q: A person must score in the upper 0.15% of admission test scores in order to qualify for a very…

A: Let x be the marks obtained by the person. Let y be the minimum score that the person must achieve…

Q: Are low-fat diets or low-carb diets more effective for weight loss? This question was addressed by a…

A: Given that, for a low-carbohydrate diet n1=77, x1=4.7 kg, s1=7.2 kg For a low-fat diet, n2=79,…

Q: A history professor is curious if students who studied from Printed hard copy had different mean…

A: (1)   State the hypotheses. That is, there is no sufficient evidence to conclude that there is 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 Graduate Management Admission Test (GMAT) is taken by individuals interested in pursuing…

A:

Q: A famous welfare association in Karachi claims that it takes 9 minutes on average to reach its…

A: State the hypotheses. That is, the average time ambulance takes to teach its destination equals 9…

Q: State the conclusion in the problem context.   We fail to reject H0. It is not reasonable to…

A:

Q: A person must score in the upper 0.15% of admission test scores in order to qualify for a very…

A: A person must score in the upper 0.15% of admission test scores in order to qualify for a very…

Q: In general, train commuting time for VU students travelling to campus from home is normally…

A: Given that :mean (μ)=52 Standard deviation (σ)=7 Let X be the random variable of the students who…

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: In a certain country the heights of adult men are normally distributed with a mean of 68.2 inches…

A: Given,mean(μ)=68.2Standard deviation(σ)=2.4

Q: Location is known to affect the number, of a particular item, sold by an auto parts facility. Two…

A: GivenFor Location A:-sample size(n1)=13Mean(x1)=39standard deviation(s1)=8For Location B:-sample…

Q: The distribution of average wait times in drive-through restaurant lines in one town was…

A:

Q: Using 1% level of significance, test if the population average is not 73.

A: A normally distributed standardized English test is known to have a mean score of 73 and a standard…

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

A: The data set of ages is25,27,20,21,29sample size(n)=5

Q: If only the upper 30% of a normally distributed class passed a quiz for which the mean was 70 and…

A: According to the given information in this question we need to find the lowest score a student could…

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

A:

Q: X1,..., Xn are iid samples from a normal distribution with n < 30 The mean and variance for the…

A: x1,x2,...,xn are samples from a normal distribution with mean µ and variance σ2 . x1,x2,...,xn ~…

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: A college entrance exam company determined that a score of 24 on the mathematics portion of the exam…

A: Note- Part (a) and part (b) is correctly solved, now I'm giving solution only for part C.   Given…

Q: The Fair Isaac Corporation (FICO) credit score is used by banks and other lenders to determine…

A: Population mean = ? = 720 Sample S.D = s =95 Sample size = n =75 Sample mean = x̅ = 725…

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

A: X follows a Normal distribution with mean = 1469 and S.D = 296 Then z=(x-mean)/SD = (x-1469)/296…

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

A:

Q: According to a study of TV viewing habits, the average number of hours an American over the age of 2…

A: Given data,Standard deviation is σ=16If n=64 standard error of the mean(σx)=?

Q: A research article reported that for a random sample of 850 meal purchases made at fast food chain…

A: we have given that  n1=850 ,xbar1=1004 ,s1=489 ,n2=2108 ,xbar2=905 ,s2=622 and alpha =0.05  degree…

Q: Are low-fat diets or low-carb diets more effective for weight loss? This question was addressed by a…

A: