A random sample of 81 ninth grade student's scores on a national mathematics assessment test has a mean score of 272. This test result prompts a state school administrator to declare that the mean score for the state's ninth graders on this exam is more than 270. Assume that the population standard deviation is 30. At alpha= 0.05, is there enough evidence to support the administrator's claim?

Q: In each of the following cases, determine whether the sample size n is large enough to use the large…

A: (a) P^=0.1, n=30 (b)P^=0.1,n=100 (C)P^=0.5, n=50   We know that If nP^  and  n1-P^ both are greater…

Q: 12.2.5Truck Unloading Times A warehouse manager is interested in the possible improvements to labor…

A: Since you have posted a question with multiple sub-parts, we will solve first three sub- parts for…

Q: The life of light bulbs is distributed normally. the standard deviation of the lifetime is 32 hours…

A:

Q: The degree of freedom for a Chi-Squared test of a contingency table with 6 rows and 3 columns is…

A: Answer: From the given data, Number of rows (r) = 6 Number of columns (c) = 3

Q: The life of light bulbs is distributed normally. The standard deviation of the lifetime is 25 hours…

A:

Q: For a goodness-of-fit test for a distribution with 3 categories, what are the degrees of freedom for…

A: Given:   Distribution with 3 categories  k=3

Q: Use the TI-84 Plus calculator to find the z-score for which the area to its left is 0.59. Round the…

A: The z-score is 0.59 To find the area left to the z score 0.59. The variable z represents the…

Q: m is extremely important to the economy of Florida. Hotel occupancy is an often-reported measure of…

A: Solution: from given information claim: There has been an increase in the proportion of rooms…

Q: The table summarizes results from 984 pedestrian deaths that were caused by automobile accidents.…

A: Driver Intoxicated? Pedestrian Intoxicated? Yes No Yes 42 83 No 278 581

Q: The accompanying data represent the annual rates of return of two companies' stock for the past 12…

A: Since you have posted a question with multiple sub-parts, we will solve first three sub- parts for…

Q: The following data represent crime rates per 1000 population for a random sample of 46 Denver…

A: Given data, 63.2 36.3 26.2 53.2 65.3 32.0 65.0 66.3 68.9 35.2 25.1 32.5 54.0 42.4 77.5 123.2 66.3…

Q: In Mendel’s pea experiments, 6,022 yellow peas were observed out of a sample of 8,023 peas. Test the…

A: sample size(n)=8023x=6022sample proportion(p^)=xn=60228023≅0.7506significance level(α)=0.01

Q: A retail sales associate claims that the tax preparation methods of adults are distributed as…

A: The null and alternative hypotheses are stated as follows:

Q: Accounting Today identified top accounting firms in 10 geographic regions across the United States.…

A: This question examines the differences in the variability in the number of partners in accounting…

Q: Suppose the U.S. president wants an estimate of the proportion of the population who support his…

A: (a) The formula of sample size is, Procedure for finding the z-value is listed below:   From the…

Q: Construct the scatter plot using your TI calculator and comment on the relationship (no need to show…

A: From the above question We are given that Let y be Ford’s market share at x years since 2015.…

Q: The life of light bulbs is distributed normally. the standard deviation of the lifetime is 29 hours…

A: Answer: From the given data, mean(μ) = 590 standard deviation(σ) = 29 X = 608

Q: Two people are arguing about the size of different breeds of dogs. One believes that German…

A: Weight of ten dog of each breed is given. Here, n1=10 n2=10 alpha=0.05

Q: 1.1.6An experiment to compare k= 3 factor levels has n₁ = 17 and x₁ = 32.30, n₂ = 20 and x₂ = 34.06,…

A: An experiment to compare k = 3 factor levels has n1 = 17 and x1 = 32.30, n2 = 20 and x2= 34.06, and…

Q: he lengths of text messages are normally distributed with a population standard deviation of 6…

A: The sample size is 27, sample mean is 25 and the population standard deviation is 6.

Q: Giving a test to a group of students, the grades and gender are summarized below A B с 7 2 12 Male…

A: Total=7+2+12+3+18+20=62 A=7+3=10

Q: As chairperson of the Rogers County Task Force on Aging, you wish to estimate the proportion of…

A: Sample size n =44 Favorable cases x =22 Sample proportion p^=x/n  =22/44 =0.500

Q: Find the value of *)") for each of the following cases: (a) The events A, B, C are disjoint events…

A: Use the formula P(A∪B∪C)=P(A)+P(B)+P(C)-P(A∩B)-P(A∩C)-P(B∩C)+P(A∩B∩C)

Q: Recall that a bank manager has developed a new system to reduce the time customers spend waiting to…

A: For the distribution of waiting time of 93 sampled customers (i.e., the sample size, n=93), it is…

Q: c. Compute the p-value. NOTE: P-value calculators are available through online search. (Round your…

A: Let μ1 and μ2 be the population mean number of times men and women order take-out dinners. Given…

Q: You have taken a random sample of size from a normal population that has a population mean of -tee…

A: Sample size n=18 Population mean μ=100 Population standard deviation σ=3 Sample mean x¯=98.8

Q: Pathological gambling is an impulse-control disorder. The National Gambling Impact Study Commission…

A: n=2877, X=193, p=6%=0.06, α = 0.1  Note: According to bartelby question answer guidelines an expert…

Q: The values for P(A₁ B) and P(A₂B) were found to be 0.20 and 0.02, respectively. Use these values to…

A: P(A1⋂B)=0.20, P(A2⋂B)=0.02

Q: People often say they vividly remember the details surrounding a particular event, which attests to…

A: The information in Table 1 is drawn from a recognition memory task in which participants are given a…

Q: lower confidence limit (LCL) and upper confidence limit (UCL) of the mean for each of the = 241,…

A: a) 95% confidence level  b) 99% confidence level

Q: According to a study conducted by a statistical organization, the proportion of people who are…

A: The population is the data which includes all the observations that were used for the study. When…

Q: What is the predicted response value?

A: Regression Equation  y= 0.561x- 12.303 r=0.794

Q: Describe the shape of the sampling distribution of p. Choose the correct answer below. A. The shape…

A: It is given that  N = 25000 n = 900 p = 0.371

Q: Several years ago, 41% of parents with children in grades K-12 were satisfied with the quality of…

A: We have given that.Sample size (n) = 1135 x = 468 Confidence level (c) = 0.90 Significance level (α)…

Q: For a Chi-Squared Goodness of Fit Test about a distribution that has the following characteristics:…

A: The given distribution is, Categories Percentage 1 20% 2 30% 3 10% 4 15% 5 25%

Q: If on average 8 ships out of 12 arrive safely at ports obtain mean and standard deviation of number…

A: Answer: From the given data, The probability that the ship arrive safely = p = 812= 0.67 Number of…

Q: Fill in the table below: Find : 5 Find y: 4 Find 8: 8 9 Find Sy 3 4 0 x-x 3 -2✔ 0 Find r: 0.86 0 3…

A: The question is about correlation and regression  Data : No. of pairs of x and y ( n ) = 3   To…

Q: A group of people were asked if life exists elsewhere in the galaxy. 350 responded "yes", and 413…

A: Probability= n(E)/n(S) Where  n(E)= number of possible events n(S) = total number of possibilities.…

Q: Reading proficiency: An educator wants to construct a 95% confidence interval for the proportion of…

A:

Q: everse engineering the confidence interval. The 95% confidence interval in Your textbook exercise,…

A: Since you have posted a question with multiple sub-parts, we will solve first three sub- parts for…

Q: Find the probability of the given event:- Event: Drawing a jack card randomly from a well…

A: Answer: Using the given data, Given event is, Drawing a jack card randomly from a well shuffled deck…

Q: In a survey conducted by the Gallup​ Organization, 1100 adult Americans were asked how many hours…

A: Given data, In a survey conducted by the Gallup​ Organization, 1100 adult Americans were asked how…

Q: A sample of size n taken from a normal population with a known variance of o² = 9.7969 is used to…

A: From the given information, σ2=9.7969.

Q: sample was done, collecting the data below. Calculate the standard deviation, to one decimal place.

A: For given Sample  X=13,8,1,11,29

Q: Calcium levels in people are normally distributed with a mean of 9.3 MG and a standard deviation of…

A: The standardised normal score is Z score.

Q: A poll reported that only 507 out of a total of 1809 adults in a particular region said they had a​…

A: The sampled no. of adults, i.e., the sample size, n=1809. The no. of sampled adults who expressed a…

Q: In an experiment, a coin is tossed until the head is observed for the second time. What is the…

A: It is given that a coin is tossed until the head is observed for the second time. Define sample…

Q: X 400 390 500 355 375 350 370 480 450 500 Y 20 19 28 15 19 16 18 26 22 27

A: Our explanatory variable is the number of defective products yielded by a machine. Our response…

Q: MULTILINEAR REGRESSION: 1) The table shows the distribution of weight, height and age for a sample…

A: Since you have posted a question with multiple sub-parts, we will solve first three sub- parts for…

Q: The results of a hypothesis test are reported as follows in a scientific report: t(38) = -3.13, p <…

A: It is required to choose the correct option using the hypothesis test report.