A schoolteacher is worried that the concentration of dangerous, cancer-causing radon gas in her classroom is greater than the safe level of 4pCi/L. The school samples the air for 36 days and finds an average concentration of 4.4pCi/L with a standard deviation of 1pCi/L. To test whether the average level of radon gas is greater than the safe level, the appropriate hypotheses are __________

Q: 14) Xi -2 -1 0 1 Consider the following probability distribution. The variance is A) 1.14 B) 1.29 C)…

A: Xi.              P(X=Xi) -2.                 0.2 -1.                 0.1 0.                 0.3 1.…

Q: Given the set {84.60, 84.60, 83.90, 83.90, 83.70, 83.60, 83.40, 83.40, 83.30, 83.30, 83.00, 82.80.…

A: The provided data set is:   84.60, 84.60, 83.90, 83.90, 83.70, 83.60, 83.40, 83.40, 83.30, 83.30,…

Q: Bloso and the research unit of the Flemish government keep track of the people who join a sports…

A: a) The frequency distribution of the female members of sports club with respect to their age is as…

Q: 4. The number of hours 6 students spent for a test and their scores on that test are shown below:…

A: The number of hours 6 students spent for a test and their scores on that test are shown below:…

Q: A numeric lock has a 3 digit key HINT 682 614 206 number is correct One number is correct Two number…

A: 6 8 2 one number is correct and well placed 6 1 4 one number is correct but wrongly placed…

Q: 20. Test the claim about the population proportion p *0.325 given n = 42 and p^ = 0.247. Use a =…

A: It is provided that: The sample size, n=42. The sample proportion, p^=0.247. The level of…

Q: 10. The data below represent the number of streaming hours listened to per day by a sample of 9…

A: 1, 2, 8, 3, 8, 9, 2, 7, 6

Q: 2. An elementary school teacher is interested in determining whether her male students will report…

A:

Q: Suppose a manufacturer of Vaporizer cartridges samples 200 cartridges and measures a failure rate of…

A: n=200 p=0.015

Q: The following data, reproduced from Table 3.8 of Example 3-14, give the frequency distri- bution of…

A: Daily commuting time Number of employees  0 to less than 10 4 10 to less than 20 9 20 to less…

Q: 6. The table below shows the results of a survey of drivers who were asked to name the most annoying…

A: Talking on cell phones = 44 %  6 person randomly selected to participate  We have to calculate…

Q: Decide whether the normal sampling distribution can be used. If it can be used, test the claim about…

A: Claim is p≠0.23 α=0.10 sample proportion(p^)=0.19 sample size(n)=100

Q: 5.3 Graph Frequency Distributions 1. James is looking to purchase a set of used 20" alloy tires for…

A: The data for the prices in ascending order is given.

Q: 60% of all the students passed an exam. If a random sample of 10 students is selected, What is the…

A: n=10, p=0.60

Q: Determine whether there appears to be a Main Effect for IV-A by writing “YES” or “NO”  Determine…

A: The table for two effects A and B is given.

Q: Part 1-Sampling the Fundraiser The fundraiser was a great success (thanks to your hard work), but…

A: The task is to analyze six different sampling strategies that can be used to survey attendees who…

Q: If 66,500 duracell batteries are manufactured, approximately how many of those batteries

A: Here Given  The life span of Duracell batteries is normally distributed. The mean life span is…

Q: Problem 4. IV-B 1 2 1 1 9 IV-A 2 5 5

A: For the given data,  Main Effect for IV-A: NO Main Effect for IV-B: NO

Q: Exw Σω Weighted mean where Exw is obtained by multiplying each data value by its weight and then…

A: Sup- pose an instructor gives two exams and a final, assigning the final exam a weight twice that of…

Q: What is the lower bound of that confidence interval ?Minting Quarters Listed below are weights…

A: Let, x denotes the weight of quarters minted. Thus, the data is given as- x 5.779 5.5928…

Q: The following data, reproduced from Table 3.8 of Example 3-14, give the frequency distri- bution of…

A: Class Frequency 0 - 10 4 10 - 20 9 20 - 30 6 30 - 40 4 40 - 50 2

Q: A random sample of three students was selected and their study hours over last weekend were…

A: According to the given information, we have Total number of students = 3

Q: The following table shows the hours studied and corresponding test grade earned by students on a…

A: The formula for correlation coefficient (r) is ,  r = n∑xy - ∑x∑yn∑ x2-∑x2n∑ y2-∑y2 Calculation :…

Q: A psychology teacher gave an objective-type test to a class of 500 students and, after seeing the…

A: In this problem, we will explore how a psychology teacher assigns grades based on a normally…

Q: a. What is the sample regression equation? b. Interpret the slope coefficient for x1. c. Find the…

A: The regression results are given. Since you have posted a question with multiple sub-parts, we will…

Q: Each year, the newspaper America at a Glance writes an article about the performance of students on…

A: From the provided information, Mathematics test score Frequency 550 to 599 4 600 to 649 11…

Q: Listed below are paired data consisting of movie budget amounts and the amounts that the movies…

A: x y 40 112 23 18 113 110 73 59 75 113 51 112 116 97 69 102 10 47 55 98 125 206…

Q: Q3: Let X₁, X2, ......., Xn be i.i.d from Gamma distribution (x~ GAM( e, 3), show that s= sufficient…

A: x1, x2....xn be the Gamma distribution with (θ, 3) then we have to show that s=∑x is sufficient…

Q: (b) Develop the three-week moving average forecasts for this time series. (Round your answers to two…

A: The question is about forecasting  Given :   To find : b ) develop 3 week mov. avg. forecast, MSE…

Q: The table gives the relative frequency of the number of cavities for two groups of children trying…

A: (a) The population mean for group A is obtained below as follows: From the given information,…

Q: Q2: Let X1, X2, , Xn be random sample from N~(μ, 36), ******* 1- find the CRLB for μ 2- find UMVUE

A: A random sample of size n is taken from Nμ,36 population where the population mean is the unknown…

Q: An analysis of variance is used to compare the differences in O variances O standard deviations O…

A: The study is about the analysis of variance.

Q: In a random sample of 400 headache suffers, 85 prefer a particular brand of pain killer. Construct a…

A: We have given thatn = 400x = 85p̂ = x/n = 85/400 = 0.2125

Q: The following table gives the data for the average temperature and the snow accumulation in several…

A: The data shows average temperatures and snow accumulations.

Q: Write the formula Consider the following hypothesis:   Ho: µ ≤ 25 For a given sample with x̅​​​…

A: Sample size n =36 Sample mean=26 Population standard deviation =6

Q: The manager of an automobile dealership is considering a new bonus plan designed to increase sales…

A: “Since you have asked multiple questions, we will solve the first question for you. If you want any…

Q: The following table shows the age and selling price of cars sold recently at a used car lot.…

A: Car Age Price ($) 1 34,659 2 27,849 4 16,479 5 12,505 6 9879 6 11,565 8 10,499 10…

Q: genetic experiment involving peas yielded one sample of offspring consisting of 441 green peas and…

A: n=441+226 P=0.23 Alpha=0.01

Q: Small sample: During an economic downturn, 19 companies were sampled and asked whether they were…

A: Sample size, n=19 No. of companies planning to increase the workforce, x=3 CL=0.90

Q: Suppose X~Bino(n=6, p=0.4).  What is P(X > 4)?

A: From the provided information, X~Bino(n=6, p=0.4)

Q: Determine the test statistic for this hypothesis test. to = (Round to two decimal places as needed.)

A: We make the following table for the calculation sample mean and sample standard deviation for the…

Q: For the data set with u = 50 and a= 5 What percent of the data is between… 45 and 50 __________ 45…

A: Solution-: Given: μ=50,σ=5 We want to find  What percent of the data is between 45 and 50? What…

Q: (b) Ship collisions in the Houston Ship Channel are rare. Suppose the number of collisions are…

A: The random variable X is the number of collisions It follows the Poisson distribution The mean…

Q: Giving a test to a group of students, the grades and gender are summarized below   A B C Total Male…

A: A B C Total Male 18 10 12 40 Female 7 15 20 42 Total 25 25 32 82

Q: 4. Suppose a clothing store owner is analyzing store traffic. They find that female customers arrive…

A: Suppose a clothing store owner is analyzing store traffic. They find that female customers arrive…

Q: The contingency table shows how a random sample of adults rated a newly released movie and their age…

A: Null hypothesis: Alternative hypothesis:

Q: Test the hypothesis that school type and subsequent major are not independent

A:

Q: Giving a test to a group of students, the grades and gender are summarized below A B C Total…

A: Total students is 73

Q: Use the given data to find the equation of the regression line. Round the final values to three…

A: x y 6 2 8 4 20 13 28 20 36 30

Q: X 7 y Valid N (listwise) A B I F G y Person X C D E 100 93 90 86 82 80 80 Pearson Correlation Sig.…

A: In the given table, the data is given as- The correlation between x and y is- r =0.444 Mean and…