A marketing company is interested in whether a particular advertisement will increase in a new social networking website. A random sample of 15 teenagers is chosen, and their interest level in the new website is measured on a scale of 1–100 scale before and after seeing the advertisement. Test the claim at 10% level of significance. The individual results are as follows: Beforead 33 28 25 37 42 55 41 19 30 51 44 37 25 36 45 Afterad 37 30 26 34 40 59 40 17 27 51 47 35 28 38 49

Q: Adult Americans were asked if they felt that food packaging labels were truthful. Sixty-seven…

A: GIVEN DATA P( felt that food packaging labels were truthful) = p = 0.67 sample size (n) = 90 x = no.…

Q: 1. A certified mechanic was timed for the repair of an automobile on 14 separate occasions. Over the…

A: 1. Let μ1 be the average time a certified mechanic takes for the repair and μ2 be the average time a…

Q: The following study looks at a random sample of whether a person has tattoos and the presence of…

A: Solution: The given table of data is

Q: Suppose that the unemployment rate for 18- to 34-year-olds was reported to be 10.6%. Assume that…

A: Given, The unemployment rate for 18- to 34-year-olds was reported to be 10.6% based on a random…

Q: A pharmaceutical company receives large shipments of aspirin tablets. The acceptance sampling plan…

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

Q: Six different plug-in hybrid vehicles were tested for their electric-only driving range. The same…

A: We have to find the median .

Q: Rating Increase $2400 $2600 $1800 Rating Increase $2000 $2600 Auniversity would like to examine the…

A: Given data: Sl. No. Rating (X) X^2Increase (Y) 1 17 2400 2 18 2600 3 12 1800 4 13 1600…

Q: n a population-based cohort study, an entire community was interviewed regarding smoking habits and…

A: Here the given table is   we have to Calculate the proper measure of association of smoking and lung…

Q: The college physical education department offered an advanced first aid course last summer. The…

A: As per the guidelines we are allowed to solve maximum of 3 subparts, If you need help with another…

Q: According to previous studies, 10% of the U.S. population is left-handed. Not knowing this, a high…

A: From the provided information,

Q: A random sample of 1020 heads of households was taken from a customer list for a bank. The…

A: Chi-square Statistic is given by, Chi-square= summation (Oi-Ei)2/Ei Where Oi's are observed values…

Q: In January 2013, a poll by ABC News indicated that Obama's popularity had reached a three-year high.…

A: We can use the given proportions to calculate the expected frequencies for each response by sex: For…

Q: The XYZ company wants to see if interview scores predict job performance scores. So it goes back…

A: The claim is to check whether there is a relationship between employee interview scores and employee…

Q: Imagine a dataset with a mean of 60 and a median of 40, what does this tell you about skewness?

A: Given : mean = 60  median = 40

Q: Robyn Banks is an investor who acquired 100 shares of a company in year one at $10 and 50 shares of…

A: If the observations have unequal weightage then their mean value can be calculated by dividing the…

Q: Suppose that we know that 33.8% of the people born in the United States between 1936 and 1951 have…

A: The given situation follows binomial distribution. The proportion of people born in United States…

Q: Given that the total sample of an FDT is 432, and the relative frequency of one of the classes is…

A: Total total relative frequency is add up to 100%  Here the  relative frequency of one class is…

Q: In 1955, Life Magazine reported that the 25 year-old mother of three worked, on average, an 80hour…

A: Solution: Given information: n= 85 Sample size  x= 83.5 Sample mean μ= 80 Populaion Mean s= 10…

Q: The responses of a sample of 1001 people who were asked if their next vehicle will be foreign or…

A: Mean, median and mode combined together are called measures of central tendency. For a set of…

Q: The sample mean is the point estimator of 18

A:

Q: The U.S. Department of Transportation, National Highway Traffic Safety Administration, reported that…

A: Given that, Sample size n=54 Sample proportion of automobile driver fatalities that involved an…

Q: Use the given data and a 5% level of significance to determine whether the population varience for…

A:

Q: A marketing firm is doing research for an Internet-based company. It wants to appeal to the age…

A: Step 1: From the provided information, Step 2: Confidence level = 90%The degrees of freedom can be…

Q: A population of scores has a mean of ? = 35 and ? = 3.5. Find the z-scores that correspond to the…

A: Solution- Given that mean mu=35 and standard deviation s=3.5 Find Z score for corresponding X values…

Q: Recent reports suggest that children who grow up with family members who use drugs are more likely…

A: From the given information we conduct chi squared test.

Q: In a city with three high schools, all the ninth graders took a Standardized Test, with these…

A: high school mean test score(x¯i) frequancy(fi) glenwood 84 257 central 92 308 lincoin 71 186…

Q: A statistics teacher claims that, on average, 20% of students in his class get an A, 25% get a B,…

A: Given Information: Proportion of students who get an A i.e., pA=0.20 Proportion of students who get…

Q: A coffee shop tracks sales and has observed the distribution in the following table. What is the…

A: a) Average daily sales = mean = E(X)

Q: An educator want to determine whether early exposure to school affect IQ. He enlists the aid of…

A: We set up the, Null Hypothesis(H0):μx=μy , there is no diffrence between the mean IQ of children who…

Q: State the distribution to use for the test (Enter your answer in the form z or tar where af is the…

A: n =77mu = 80xbar = 83s = 10

Q: Zika is a serious and highly contagious virus. The Department of Health keeps records of all…

A: given data   test positive test negative total haszika 8.2% 0.7% 8.9% does not have zika 2.3%…

Q: The British Department of Transportation studied to see if people avoid driving on Friday the 13th.…

A: Given that  Level of significance=0.10   We have to test hypothesis for the claim that  on average…

Q: We wish to determine whether there is a relationship between the gender of a teenager and their…

A: Null hypothesis: H0: There is no relationship between the gender of teenagers and the preferred…

Q: A certified mechanic was timed for the repair of an automobile on 14 separate occarision. over the…

A: From the given data: x¯1=250.93    n1=14       s1=62.9768x¯2=273.79    n2=14       s2=77.5918…

Q: ONLY PART C AND D PLEASE!

A: Provided data is: Dorms Apartments At Home 8 2 5 9 1 4 7 3 3 8…

Q: (a) State the null and alternate hypotheses. H: The proportions of crimes in the various categories…

A: To state the null and alternate hypothesis for the proportion of crimes in the various categories in…

Q: tects data each year on price of a big Mac in various untries ar the wor The price of a Big Mac for…

A: Given that  Sample size n =8 Population mean μ =3.57

Q: How often do you go out dancing? This question was asked by a professional survey group on behalf of…

A: Let p1: proportion of single men who go out dancing occasionally p2:proportion of single women who…

Q: (fo-fe) Fill in the missing values in the table. Round your responses for the expected frequencies…

A: Does it seem to you that people tend to be absent more on some days of the week than on others First…

Q: Matt Gaetz, a health educator, wants to evaluate the effect of a dental film on the frequency with…

A: Given: Subject After Film Baseline 1 28 25 2 29 28 3 25 22 4 30 30 5 25 26 6 27 24…

Q: A Statistics teacher wants to know if students exposed to the use of technology in the classroom got…

A: The random variable score is normally distributed. There are two independent samples which are…

Q: A marketing firm is doing research for an Internet-based company. It wants to appeal to the age…

A: The degree of freedom =minn1-1,n2-1=min15,20=15 Then, at α=0.2, the critical value of t is 1.3406.

Q: A local park district is planning to build a recreation center. The park district conducted a poll…

A: Introduction: We need to determine if it is reasonable to assume that 62% of the respondents…