In a study to compare the effectiveness of distance learning with traditional classroom instruction, 12 students took a business course online while 14 students took it in a classroom. The final exam scores for the online students averaged 76.8 with a standard deviation of 8.6, and the final exam scores for the classroom students averaged 80.1 with a standard deviation of 9.3. Can you conclude that the traditional classroom instruction was more effective?

Q: A pharmaceutical company claims that a drug is effective in treating 90% of people having severe…

A: Given that,The random variable follows binomial distribution,n=6p=90%=0.9,q=1-p, q= 0.1

Q: Two researchers conducted a study in which two groups of students were asked to answer 42 trivia…

A: Given: Formula used:

Q: If a population has a standard deviation σ of 36 units, what is the standard error of the mean if…

A: The population standard deviation is 36.

Q: In a certain city, the average 20- to 29-year old man is 69.8 inches tall, with a standard deviation…

A: Given: The man has a mean of 69.8 inches tall and a standard deviation = 3.2 The z score for the man…

Q: The time that a shopper spends in the grocery store is normallydistributed, with a mean of 45…

A: Given Information: The time that a shopper spends in the grocery store is normally distributed with…

Q: Two researchers conducted a study in which two groups of students were asked to answer 42 trivia…

A: Given α=0.10n1=200x1=26.3s1=5.2n2=200x2=17.6s2=2.8

Q: Statewide, the average score on the verbal portion of the college entrance exam is 453, with a…

A: From the provided information, Sample size (n) = 137 Sample mean (x̅) = 502 Population standard…

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: Two researchers conducted a study in which two groups of students were asked to answer 42 trivia…

A: (a) The degrees of freedom is,…

Q: A shareholders' group, in lodging a protest, claimed that the mean tenure for a chief executive…

A: Given information: The investigator is specially interested to test whether the mean tenure for a…

Q: According to a dietary study, high sodium intake may be related to ulcers, stomach cancer, and…

A:

Q: In a study of employee stock ownership plans, satisfaction by employees is measured and found to be…

A: Given,mean(μ)=4.89standard deviation(σ)=0.63sample size(n)=450

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: "According to Dietary Goals for the US (1977), high sodium intake may be related to ulcers, stomach…

A: Claim : the average sodium content for a single servings of noodles is less than 220 milligrams.

Q: If the standard deviation of sample A  is 5 and the standard deviation of sample B  is 12, what is…

A:

Q: Two researchers conducted a study in which two groups of students were asked to answer 42 trivia…

A:

Q: A recent Gallop Poll indicates that 80 % of voting age adults disapprove of Congress. If 700 voting…

A: Let p be the probability that a voting age adult disapproves of Congress. Given that p = 0.80 Let X…

Q: Two researchers conducted a study in which two groups of students were asked to answer 42 trivia…

A: Given: n1=200, X1=24.7, s1=4.1n2=200, X2=15.4, s2=2.6α=0.1

Q: In a certain city, the average 20- to 29-year old man is 72.5 inches tall, with a standard deviation…

A: From the provided information, The height of men is normally distributed with mean (µ) = 72.5 inches…

Q: In Melanie's Styling Salon, the time to complete a simple haircut is normally distributed with a…

A: Given, Mean = μ =25SD = σ =4

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

A:

Q: Two researchers conducted a study in which two groups of students were asked to answer 42 trivia…

A:

Q: An online stock trading company makes part of their revenue from clients when the clients trade…

A: sample mean (x̄)  = 82 population mean (µ) = 85 sample size (n) = 120 sample standard deviation (s)…

Q: According to a dietary study, high sodium intake may be related to ulcers, stomach cancer and…

A:

Q: An incoming freshman took her college’s placement exams in French and mathematics. In French, she…

A:

Q: the standard error of the mean for a random sample of 49 tax returns is ________.

A: Given information Mean = $ 1,949 Standard deviation = $750 Sample size = 49

Q: Two researchers conducted a study in which two groups of students were asked to answer 42 trivia…

A: Given that

Q: If research samples 28 college students and wants to compare the sample mean of 8 to the population…

A: From the provided information, Sample size (n) = 28 Sample mean (x̄) = 8 Population mean (µ) = 12…

Q: In a certain city, the average 20- to 29-year old man is 69.4 inches tall, with a standard deviation…

A: Given: For Man:      Avg = 69.4      SD = 3.2 For Women:       Avg = 64.3        SD = 3.9 Who is…

Q: ) H0: ?1 − ?2 = 0 Ha: ?1 − ?2 > 0     t=_________ P-value_______   State the conclusion in the…

A:

Q: Two researchers conducted a study in which two groups of students were asked to answer 42 trivia…

A: The mean and standard deviation for group 1 are  x1=22sd1=3.5n1=200 The mean and standard deviation…

Q: According to a dietary study, high sodium intake may be related to ulcers, stomach cancer and…

A:

Q: Two researchers conducted a study in which two groups of students were asked to answer 42 trivia…

A:

Q: An LED lightbulb manufacturer produces lights with a mean lifespan of 10,000 hours and a standard…

A: the PDF of normal distribution is = 1/σ * √2π * e ^ -(x-u)^2/ 2σ^2standard normal distribution is a…

Q: Two researchers conducted a study in which two groups of students were asked to answer 42 trivia…

A: Obtain the 90% confidence interval for the difference between the scores The 90% confidence interval…

Q: In a certain​ city, the average​ 20- to​ 29-year old man is 72.5 inches​ tall, with a standard…

A: z- score for a 75-inch man =  0.833 z- score for a​ 70-inch woman = 1.447

Q: According to a dietary study, high sodium intake may be related to ulcers, stomach cancer and…

A:

Q: A high end store is looking to open new stores, but requires that 85% of the households in a…

A: Let X= income of the households  Given that X is normally distributed with mean= 98000 and standard…

Q: Two researchers conducted a study in which two groups of students were asked to answer 42 trivia…

A:

Q: according to police sources, a car with a certain protection system will be recovered 90% of the…

A: Given problem is a binomial distribution with:

Q: A company selling a new MP3 player advertises that the player has a mean lifetime of 5 years. If you…

A:

Q: In a certain​ city, the average​ 20- to​ 29-year old man is 72.5 inches​ tall, with a standard…

A: 72.5 3.1 75 64.3 3.8 70

Q: In a certain city, the average 20- to 29-year old man is 72.5 inches tall, with a standard deviation…

A:

Q: A report from the Illinois Department of Wildlife indicates that when a car and deer collide, there…

A: Given: 40 deer fatalities per 100 collisions between a car and a deer

Q: The daily sales at a convenience store have a mean of $1280 and a standard deviation of

A: As given, the daily sales at a convenience store have a mean of $1280 and a standard deviation of…

Q: A researcher reports that the average income of system analysts in Makati is P44,000 per month. A…

A: Given: Average(μ)=44000sample size(n)=30Sample mean(x¯)=45800Standard deviaion(s)=5400

Q: An online stock trading company makes part of their revenue from clients when the clients trade…

A: In the given problem we have,  n = sample size = 120 The average number of trades per year was 82…

Q: Two researchers conducted a study in which two groups of students were asked to answer 42 trivia…

A:

Q: In a study of Ridge View's boys' basketball team, the average height is 68 inches and standard…

A: Given that, In a study of Ridge view's boys' basketball team, the average height is 68 inches and…

Q: Cushman and Wakefield reported that the average annual rent for office space in Tampa was $17.63 per…

A: H0 : ? =17.63     H1 : ? ≠17.63     Population mean = ? = 17.63 Sample S.D = s =3.64…