MathStatisticsQ&A LibraryAckerman and Goldsmith (2011) found that students who studied text from printed hardcopy had better test scores than students who studied from text presented on a screen. In a related study, a professor noticed that several students in a large class had purchased the e-book version of the course textbook. For the final exam, the overall average for the entire class was μ = 81.7 but the n = 9 students who used e-books had a mean of M = 77.2 with a standard deviation of s = 5.7. Is the sample sufficient to conclude that scores for students using e-books were significantly different from scores for the regular class? Use a two-tailed test with α = .05.

Question

- Ackerman and Goldsmith (2011) found that students who studied text from printed hardcopy had better test scores than students who studied from text presented on a screen. In a related study, a professor noticed that several students in a large class had purchased the e-book version of the course textbook. For the final exam, the overall average for the entire class was μ = 81.7 but the n = 9 students who used e-books had a mean of M = 77.2 with a standard deviation of s = 5.7. Is the sample sufficient to conclude that scores for students using e-books were significantly different from scores for the regular class? Use a two-tailed test with α = .05.

Tagged in

Math

Statistics

Find answers to questions asked by students like you.

Q: The US population is 13% African American. If you were to take a SRS of 500 Americans, above what p...

A: Solution:From the given information, the proportion of African American is 0.13, random sample of si...

Q: A random sample of 25 observations yield a mean of 106 and a standard deviation of 12. Find the prob...

A: From the given information,Sample size 25, mean 106 and standard deviation 12

Q: Show work, don’t use shortcuts of calculator thank you

A: In a simple random sample of 400 voters, 220 said that they were planning to vote for the incumbent ...

Q: a psychologist theorized that people can hear better when they have just eaten a large meal. six ind...

A: Part a:Denote μ1 and μ2 as the means of the big meal group and the small meal group respectively.Nul...

Q: Consider a bimominal experiment with 2 trials and p=0.4 d. Find the probability of at least one succ...

A: It is given that n = 2 and p = 0.4. Therefore, q = 1–p = 0.6.The PMF of binomial distribution is giv...

Q: According to securelist, 71.8% of all email sent is spam. A system manager at a large corporation be...

A: a)The hypotheses for the test is given below.

Q: Assume that a procedure yields a binomial distribution with a trial repeated n=5n=5 times. Use some ...

A: From the given information, the binomial experiment with 5 trails and p=0.676. The probability mass ...

Q: Suppose x is a normally distributed random variable with u 55 and a 4. Find a value xn of the random...

A: Hey there! Thank you for posting the question. Since your question has more than 3 parts, we are sol...

Q: Possion Distribution The number of calls received by an office on Monday morning between 8:...

A: Here the random variable X, Number of calls between 8.00AM and 9.00 AM follows Poisson distribution ...

Q: Assume the random variable X is normally distributed, with mean u 58 and standard deviation o 4. Fin...

A: The z-score for the 12th percentile is the value such that 12% of the area under the standard normal...

Q: Question 4 is in photo

A: A.The p-value of 0.036 indicates that there is a significant difference among the treatments at any ...

Q: explain please Definition of a binomial B(n, p) rv; formulas for m and s; calculation of probabiliti...

A: Introduction to binomial distribution:Consider a random experiment involving n independent trials, s...

Q: Little Ruby's Halloween candy bag contains 20 bars of chocolate and 30 boxes of Nerds. What is the p...

A: Computing the probability that Ruby selects a chocolate bar:

Q: Suppose that the number of years that a used car will run before a major breakdown is exponentially ...

A: Exponential distribution describes wait time between any two Poisson occurrences. If T is the time t...

Q: skipping lunch- A nutritionist wishes to determine, within 3%, the true proportion of adults who do ...

A: It is given that margin of error (E) is 0.03 and the confidence level is 95%.

Q: Tanya takes her Physics test and is told that her Z-score is 3.10. If the class mean was 75 and the ...

A: Standard normal distribution:The standard normal distribution is a special case of normal distributi...

Q: The physical plant at the main campus of a large state university recieves daily requests to replace...

A: Solution: We are given that the distribution of the number of daily requests is bell-shaped and has ...

Q: An apple a day: Following are the numbers of grams of sugar per 100 grams of apple in a random sampl...

A: Sample mean and standard deviation:Descriptive statistics:Step-by-step procedure to obtain the descr...

Q: The US population is 13% African American. If you were to take a SRS of 500 Americans, below what p...

A: From the given data The US population is 13% African American

Q: Please see picture

A: Solution:1.The expected value of X is obtained below:

Q: Find the weighted average of a data set where 10 has a weight of 5, 30 has a weight of 2, and 50 has...

A: It is given that average of data set where 10 has a weight of 5,30 has a weight of 2 and 50 has a we...

Q: Help

A: The number of possible batting orders are:

Q: Let the random variable X be defined on the support set (1,2) with pdf fX(x) = (4/15)x3. Find p(X&...

A: It is given that X is a random variable on set (1,2) with pdf f(x).Assume that given random variable...

Q: Sam computed a 90% confidence interval for μ from a specific random sample of size n. He claims that...

A: Sam computed a 90% confidence interval for µ from a specific random sample of size n.

Q: A simple random sample of size n = 64 is obtained from a population with μ=80 and σ=16. (a) Descri...

A: (a) From the Central Limit Theorem, the sampling distribution of sample mean is normal distribution ...

Q: The age of a first-grader on September 1 at Garden Elementary School has the following distribution:...

A: a)The probability that she is over 6.5 years old can be calculated:

Q: Assume that females have pulse rates that are normally distributed with a mean of μ=76.0 beats per m...

A: It is given that mean and standard deviation are 76.0 and 12.5, respectively.

Q: Brandon Lang is a creative entrepreneur who has developed a novelty soap item called Jackpot to targ...

A: Note:Hey, since there are multiple sub-parts question posted, we will answer first three sub-parts a...

Q: uppose a shipment of 140 electronic components contains 3 defective components. To determine whether...

A: It is given that 140 electronic components contains 3 defective components.The engineer tests 3 comp...

Q: Problem 1

A: Given information:Mean, µ=3,510Standard deviation, σ=385

Q: Given that z is a standard normal random distribution, find z for each situation The area to the ...

A: The area to the left of z is 0.9750From the standard normal distribution tableLocate the value 0.975...

Q: In Hawaii, the rate of motor vehicle theft is 384 thefts per 100,000 vehicles. A large parking struc...

A: Computation of mean, λ:The mean value is calculated as follows:

Q: A Gallup pool indicated that 29% of Americans spent more money in recent months than they used to. B...

A: Population of interest: The population of interest can be defined as the cluster of all the individu...

Q: 6. Suppose a researcher used data on a group of third year students at MIT to estimate the following...

A: Given dataLine of best fitterm GPA=0.625+0.024atndrte1)If the sample mean atndrte is 82, sample mean...

Q: In a study of the accuracy of fast food drive-through orders, Restaurant A had 241 accurate orders ...

A: The formula for the 95% confidence interval for the proportion is given below:

Q: a study of nickels showed that the standard deviation of the weight of nickels is 150 milligrams. a ...

A: It is given that confidence level is 0.95, standard deviation is 150 and margin of error E is 20.

Q: Question 1

A: Let mu1 be the sample mean of acute schizophrenics and mu2 be the mean of chronic schizophrenics.Hyp...

Q: calculate the probability of exactly 3 successes in 4 tries. p= 0.2

A: Given:n = 4, r= 3, p = 0.2Consider that the random variable X follows a binomial distribution with p...

Q: X Y 1 2.5 4.4 1 2 13.6 4 20.7 4 25.6 36.2 5 Using the formulas for linear regression, find the const...

A: From the given information,

Q: Given that z is a standard normal random variable, compute the following probabilities P(0 ≤ z ≤ 0....

A: 1.The P(0≤Z ≤0.83) is obtained below:P(0≤Z ≤0.83)=P(Z<0.83)-P(Z<0.00)Procedure for finding the...

Q: 31 Sample size 31 Sample mean 12.85 mph 7.9 mph Population standard deviation 3.3 mph 2.8 mph 2. At ...

A: It is given that mean and standard deviation are 105 and 15, respectively.

Q: A survey asked buyers whether color, size, or brand influenced their choice of cell phone. How many ...

A: This problem involving 3 sets : Color, Size and Brandn(Color)=5n(Size)=8n(Brand)=16n(Color and Size)...

Q: Number 6.

A: 6.a.The probability that the sample mean will be greater than 50 is obtained below:From the given in...

Q: Over the past 100 days, the price of a certain stock went up on 60 days and went down on 40 days. Ex...

A: Any statistical report should provide with the necessary values along with the conclusion, so that t...

Q: A manufacturer knows that their items have a normally distributed lifespan, with a mean of 14.4 year...

A: Given information:Mean, µ=14.4Standard deviation, σ=3.8Sample size, n=23

Q: Appliance ownership- the probability that a person owns a microwave oven is 0.75, that a person owns...

A: the probability that a person owns a micro oven P(Oven) = 0.75probability that person owns a compact...

Q: 7. (Sec. 5.4) The lifetime of a certain type of battery is normally distributed with mean value 10 h...

A: Part a) To calculate the probability that the average lifetime of the batteries in the package is at...

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

A: Formula for z-score is,

Q: Explain the difference between a stratified sample and a cluster sample. (Select all that apply.) In...

A: Cluster sampling is a sampling method in which the researcher divides the population into clusters, ...

Q: For a normal population with a mean of m=80 and a standard deviation of 10, what is the probability ...

A: It is given that the mean and standard deviation are 80 and 10, respectively.