Math

StatisticsQ&A LibraryExercise 41 Suppose that a rescarcher, using data on class size (CS) and average test scores from 100 third-grade classes, estimates the OLS regression: TestScore 520.4-5.82 x CS, R-0.08, SER 11.5. a. A classroom has 22 students. What is the regression's prediction for that classroom's average test score? b. Last year a classroom had 19 students, and this year it has 23 students. What is the regression's prediction for the change in the classroom average test score? c. The sample average class size across the 100 classrooms is 21.4. What is the sample average of the test scores across the 100 classrooms? (Hint: Review the formulas for the OLS estimators.) d. What is the sample standard deviation of test scores across the 100 classrooms? (Hint: Review the formulas for the R and SER.)Start your trial now! First week only $4.99!*arrow_forward*

Question

4.1 part d

Tagged in

Math

Statistics

Find answers to questions asked by students like you.

Q: A laboratory tested 25 chicken eggs and found that the mean amount of cholesterol was 225 milligrams...

A: Confidence interval when population standard deviation is not known:The formula of confidence interv...

Q: How many different three-letter words (including nonsense words) can be formed such that the two let...

A: The permutation can be used to find the number of ways by which a set of objects can be arranged whe...

Q: I have to draw a P-Value graph using variables I calculated in a Chi-square test using Phstat in Mic...

A: Given Chi square test,Critical value = 12.59test statistic = 5.61p value = 0.47In chi square test th...

Q: Find the area of the shaded region. The graph to the right depicts IQ scores of adults, and those sc...

A: Solution: We are given that IQ scores of adults are normally distributed with mean = 100 and standar...

Q: Please show ti 84 steps

A: Given information:Here, the mean change in score corresponding to Math is x-bar=18; standard deviati...

Q: To boost holiday sales, a jewelry store in Bismark, North Dakota is advertising the following promot...

A: a) The value of z is 1.79 and it is calculated below: Let us define the random variable X as the sn...

Q: Please show TI 84 steps

A: According to the provided data, the sample size, n is 1100 with the probability of success, p is 0.8...

Q: Compute the critical value Zα/2 that corresponds to an 82% level of confidence. Zα/2 = (Rou...

A: It is given that the level of confidence is 0.82.

Q: Draw a tree-diagram to represent all probabilities for the following. A bag contains 14 green and ...

A: It is provided,Number of green marbles are 14.Number of orange marbles are 8.Total number of marbles...

Q: Find the area of the shaded region. The graph depicts the standard normal distribution of bone densi...

A: The area of the shaded region is given byP(Z>-1.08) = 1-P(Z≤-1.08)P(Z≤-1.08) = 0.14 (From Excel =...

Q: Use the accompanying data set to complete the following actions. a. Find the quartiles. b. Find the ...

A: a.Obtaining quartiles of this data:The first quartile for the given data can be obtained by entering...

Q: The waiting times between a subway departure schedule and the arrival of a passenger are uniformly d...

A: A uniform distribution has an equal probability for all the outcomes of the random variable, that is...

Q: Bags of dog food are labeled 1 through 50. What is the probability that the dog will choose a number...

A: It is provided that, the bags of food have been labeled through 1 to 50.The formula to calculate the...

Q: Please see picture

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

Q: Question 3 of 7 Game consoles: A poll surveyed 341 video gamers, and 109 of them said that they pref...

A: It is given that in the survey, it is found that 109 out of 341 video gamers said that they prefer p...

Q: 3. Determine a and b for Y X1 and Y2aX bX2 such that EX1 EX2}= 0, Var(X) Var(X2) Var(Yi) Var(2) 1, C...

A: The provided information is:

Q: According to a newspaper, 40% of bicycles stolen in a certain country are recovered. Find the prob...

A: Solution: We are given that 40% of bicycles stolen in a certain country are recovered. Let x be the...

Q: I only been b,c,and d.

A: a.The mean of this data set is obtained below:

Q: The town of KnowWearSpatial, U.S.A. operates a rubbish waste disposal facility that is overloaded if...

A: Solution: We are given:

Q: When do you use the t-statistic and what is the advantage over the z-statistic?

A: Conditions for using t statistic: The t statistic is used in the hypothesis testing, for testing the...

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

A: From the given information,

Q: Find the area of the shaded region. The graph to the right depicts IQ scores of adults, and those sc...

A: Consider, X be the random variable that represents the IQ scores of adults.It is provided that, X is...

Q: Please show TI 84 steps

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

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: Suppose that you are buying a car for $50,000, including taxes and license fees. You saved $10,000 f...

A: 13. a) The monthly payment for incentive A is $698 and it is obtained below: From the given informat...

Q: Engineers must consider the breadths of male heads when designing helmets. The company researchers h...

A: From the given information,Mean and standard deviations are 6.4 and 0.8Smallest head breadths 1.3%=0...

Q: Illustrate a venn diagram for ( D U E) c (intersection, upside down U) F sets: D ( b,a,c,k). E ...

A: Given sets areD= {b, a, c, k}E= {t, a, s, k}F= {b, a, t, h}Universal set U is = {a, b, c, h, k, s, t...

Q: Consider a binominal experiment with 2 trials and p=0.4 a. Compute the probability of 1 success f(1)...

A: Given binomial experiment with n = 2 and p = 0.4The binomial probability for x number of success is ...

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: Automobile repair costs continue to rise with the average cost now at $367 per repair.† Assume that ...

A: Click to see the answer

Q: According to scientists, the cockroach has had 300 million years to develop a resistance to destruct...

A: Obtain the critical value at 95% confidence level:It is given that,Sample mean = 10,693/5,000=2.1386...

Q: Need answers to questions 8-11.

A: Hey there! Thank you for posting the question. Since there are multiple questions posted, we will an...

Q: Today, the waves are crashing onto the beach every 5.8 seconds. The times from when a person arrives...

A: From the given information, the random variable X as he times from when a person arrives at the shor...

Q: A sample of n=4 scores is selected from a population with m=50 and standard deviation of 12. If the ...

A: It is given that the mean and standard deviation are 50 and 12, respectively.

Q: Working with the Concepts 51. Netflix: A study conducted in 2015 by the technology company Rovi (now...

A: Given dataHypothesized mean = 19.3Population Standard deviation = 8Sample mean = 21.5Sample size n =...

Q: The article "Facebook Use and Academic Performance Among College Students"† estimated that 87% perce...

A: It is given that the population proportion is 0.87. In the survey the sample proportion van be obtai...

Q: About 8% of the population has a particular genetic mutation. 1000 people are randomly selected.Find...

A: Here, X be the binomial random variable. The standard deviation for the binomial random variable is ...

Q: In a state's Pick 3 lottery, you pay $1.48 to select a sequence of three digits (from 0 to 9), such ...

A: Given Total number of picks in lottery = 3Total number of digits from 0 to 9 = 10The amount paid to ...

Q: Please show TI 84 steps

A: Computation of mean and standard deviation:Here, n=300; p̂=0.40; q̂=0.60 (=1−0.40).The mean and stan...

Q: Find the area of the shaded region. The graph to the right depicts IQ scores of adults, and those sc...

A: From the given data, mean (μ) =100 and standard deviation (σ) =15And x=96 from the given graph

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: Assume that different groups of couples use a particular method of gender selection and each couple ...

A: Introduction:Consider giving birth to a girl to be a success. The probability of success is, p = 0.5...

Q: Help

A: The number of possible batting orders are:

Q: What type of variable ( nominal or ordinal) is class?

A: Introduction::Nominal scale of measurement: A scale of measurement in which, the observations are ca...

Q: How to provide statistical interpretation of the coefficient, standard error, t-stat and p value of ...

A: Regression Coefficient:The regression coefficient corresponding to a given explanatory variable can...

Q: State the null and alternative hypothesis for the following: a) The average SAT in the state is repo...

A: a)Formulation of hypothesisNull Hypothesis: - mean for the local district is equal to 1010Alternativ...

Q: 3. (a) Based on the random sample Y1 = 5.2, Y2 4.6, use the method of maximum likelihood to estimate...

A: Note:The pdf in Part (b) will be fY (y; θ1, θ2) = 1/(θ2 – θ1) if θ1 ≤ y ≤ θ2. We have solved using ...

Q: Problem 1: If X1, X2, ... , Xn are a random sample from a population with mean u and variance o2, us...

A: Introduction:The method of moments estimator equates the population moments with the corresponding s...

Q: 5. Suppose that the probability of obtaining zero defective items in a sample of 50 items off the as...

A: It is given that P(getting zero defective items) is 0.34 and P(getting 1 defective items) is 0.46.

Q: A random sample of 26 local sociology graduates scored an average of 458 on the GRE advancedsociolog...

A: From the provided information, there are 26 sample (N) with the average (x̄) score of 458 and standa...