A manufacturer of baby powder claims that 20 out of 56 mothers prefer brand A of baby powder. A random sample of 25 mothers are selected and asked what brand of baby powder they prefer. If 8 of the 25 mothers prefer Brand A, what is the conclusion? Use z-test at 1% level of significance.

Q: Of a random sample of 172 elementary school educators, 118 said that parental support was the most…

A: Solution: Given information: n= 172 Sample size of elementary school educators x= 118 elementary…

Q: In Cleveland, a sample of 73 mail carriers showed that 10 had been bitten by an animal during one…

A: Note: Hi there! Thank you for posting the question. To avoid the plagiarism issue we have used the…

Q: in a Gallup poll of 1003 randomly selected subjects, 370 said they have a gun in their home. The…

A: The z statistic is Z=(p-mean)/standard deviation Thus, the z statistic is -2.01

Q: A college department pilots a New program with 9 of its 20 students and compares income in each…

A: The following data is provided:  New  Old 144 98 18 64 45 80 70 23 341 0 66 11 34…

Q: A filling machine for a production operation must be adjusted if 5% of the jars are under- or…

A: Given: The sample number of jars is n=100. The number of jars that are under and overfilled is X=7.…

Q: The sales rep of a waterbed claims that 25% of the Filipino died because of cardiovascular diseases.…

A:

Q: The plant manager of a company that makes pillows claims that only 8 percent of the pillows made…

A: Answer:-  Given, α=0.05 P-value=0.03 Here, 0.05>0.03

Q: 17% of all college students volunteer their time. Is the percentage of college students who are…

A: 17% of all college students volunteer their time. Is the percentage of college students who are…

Q: A college administrator wanted to know if the proportion of students who request online classes, lab…

A: Answer:  Given that, n=250 xn2=4.01 P-value = 0.1347 α=0.05

Q: From previous studies, it is concluded that 30% of workers indicate that they are mildly satisfied…

A: Note : According to our guidelines we are solving only first three sub-parts of a question and the…

Q: can you support the claim that the proportion of drivers who wear seat belts is greater in the South…

A: Given : x1= 404.0 n1= 490 x2= 279.0 n2= 380 significance level, 0.07

Q: A newspaper article indicated that 43 percent of cars with black seats are white, 46 percent of cars…

A: Given: Total categories =k=4 Degrees of Freedom= k-1 =3 chi-square test statistic = 8.2

Q: 2. Is there a difference in the proportion of individuals with food allergies between young children…

A: The sample proportions are The pooled proportion or weighted estimate of p is,

Q: The table below summarizes data from a survey of a sample of women. Using a 0.05 significance level,…

A: Here we've to test independency so we Chi-square test Statistic. Hypothesis option (A) is correct.…

Q: A recent study at a local college claimed that the proportion, p, of students who commute more than…

A: Hello! As you have posted more than 3 sub parts, we are answering the first 3 sub-parts.  In case…

Q: 2. Of 150 adults who tried a new peach-flavored peppermint patty, 87 rated it excellent. Of 200…

A: Given data of 150 adults who tried a new peach flavored peppermint patty 87 rated it excellent of…

Q: In a survey, 716 out of 1132 randomly selected adults in the United States said that they use cell…

A:

Q: In the regression model for the data collected from a balanced 2° factorial experiment, the 95% CI…

A: Given that for a balanced 23 experiment, the 95% CI for the coefficient of factor B is (-17.8, -1.7)…

Q: According to a recent poll, 53% of Americans would vote for the incumbent president. If a random…

A: Null hypothesis : H0 : μ = 0.53 Alternative hypothesis : Ha : μ ≠0.53 It is two tailed test.

Q: The National Cyber Security Alliance claims that 85% of computer owners believe that they have a…

A: Given, The sample proportion is, The null and alternative hypothesis is:

Q: A recent study at a local college daimed that the proportion, p, of students who commute more than…

A: Given that, x=55,n=265 The sample proportion is,

Q: A recent report indicated that families in a certain country typically spend about $175 per week on…

A:

Q: Two samples, each with n = 10 participants, have a pooled variance, sp2 = 180. What is the estimated…

A: From the provided information, Sample size (n1) = 10 and n2 = 10 Pooled variance (sp2) = 180 Pooled…

Q: A computer manufacturer believes that the proportion of hardware malfunctions is different in humid…

A: Ho: the evidence support the computer manufacturer's claim at the 10% significance level. H1: the…

Q: In an experiment, 11% of 734 subjects treated with viagra experienced headaches. In the same…

A:

Q: A study is made of residents in Las Vegas and its suburbs concerning the proportion of residents…

A:

Q: In a completely randomized experimental design, three brands of paper towels were tested for their…

A: In order to determine whether there is significant difference in the mean absorbency rating of three…

Q: A t-test would reject the null hypothesis at a 0.05 significance level. True or False?

A: Note: Hey there! Thank you for the question. As you have specifically asked for the decision…

Q: An organization published an article stating that in any one-year period, approximately 11.5 percent…

A: Note: Thank you for the question. Since multiple subparts are posted, according to our policy, we…

Q: Consider a sample of 50 football​ games, where 27 of them were won by the home team. Use a 0.05…

A: Given,   The sample proportion is,

Q: The National Association of Home Builders reported that 57 % of young people ages 18-24 wereliving…

A: According to the provided information, 57% (p) of young people ages 18-24 were living with their…

Q: In a recent poll, 1095 randomly selected adults were asked whether they approve of labor unions; 65%…

A: Since you have asked to solve only subpart b, we will solve only subpart b for you. Given that in a…

Q: In one trip of the Royal Caribbean cruise ship Freedom of the Seas, 168 of the 698 passengers became…

A: It is given that the 168 passengers became ill with Norovirus out of 698 passengers in Royal…

Q: The National Cyber Security Alliance claims that 85% of computer owners believe that they have a…

A: GIven: Proportion of computer owners believe that they have a antivirus program installed on their…

Q: Historically, the percentage of U.S. residents who support stricter gun control laws has been 55%. A…

A: We want to test the hypothesis

Q: Suppose a sample of adults revealed data regarding whether or not a person who smokes also has a…

A: Given Data:   Smoker Non-Smoker Total Has a Tattoo 35 70 105 Doesn't have a tattoo 20 85 105…

Q: On a normal weekend, 14% of those attending Mass at a local Catholic church donate over $200 per…

A: Given : P(donate over $200) = 0.14 P(donate Between $100 and $200) = 0.26 P(donate less than $100) =…

Q: A clinical trial is conducted to compare a new pain re- liever for arthritis to a placebo.…

A:

Q: US Universities found that 72% of people are concerned about the possibility that their personal…

A:

Q: In a previous​ poll, 43​% of adults with children under the age of 18 reported that their family ate…

A: It is given that the hypothesized population proportion (p) is 0.43 and the sample size is 1145 and…

Q: A researcher took a random sample of 200 new mothers in the United States (Group 1) and found that…

A:

Q: Does stretching before exercise reduce the chance of injury? To answer this question, a random…

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Q: The Substance Abuse and Mental Health Services Administration (SAMHSA, 2017) estimates that 10.9% of…

A: The value of p is 0.109.

Q: 6)A poll surveyed 341 video gamers, and 81 of them said that they prefer playing games on a console,…

A: From given data we have ; n=341 Sample x=81  Population  proportion p= 26% =0.26 Sample Proportion…

Q: a random sample of 16 women ( female (F)) , use their weights to test the null hypothesis that the…

A: The appropriate test for the data is One sample t test; H0 : The average weight of all the women on…

Q: In a national survey of 2013 adults, 1283 indicated that they believe rudeness is a more serious…

A: Given that

Q: An LED light bulb manufacturer claims that the average lifespan of its 60-watt LED light bulbs is…

A:

Q: In a previous poll, 29 % of adults with children under the age of 18 reported that their family ate…

A: