A survey claims that 9 out of 10 doctors (i.e., 90%) recommend brand Z for their patients who have children. To test this claim against the alternative that the actual proportion of doctors who recommend brand Z is less than 90%, a random sample of 100 doctors results in 83 who indicate that they recommend brand Z. The test statistic in this problem is approximately (round to the nearest hundredth):

Q: Based on information from a previous study, r1 = 37 people out of a random sample of n1 = 97 adult…

A: The provided information are:

Q: A sample of n=4 scores has SS=60. what is the variance for this sample?

A:

Q: Public relation companies conducted two surveys about deodorants.  The first survey asked a random…

A: Given ; n1 = 500 n2 = 550 p̂1 = 0.68 p̂2 = 0.44

Q: Based on information from a previous study, r1 = 38 people out of a random sample of n1 = 104 adult…

A: The parametric test contain the assumption of normally distribution. But the non parametric test is…

Q: State the null hypothesis, Ho, and the alternative hypothesis, Ha, that would be used to test these…

A: Given, a) Claim: There is an increase in the mean difference between posttest and pretest scores.…

Q: For a certain year a study reports that the percentage of college students using credit cards was…

A: Given that,possible chances (x)=40sample size(n)=50success rate ( p )= x/n = 0.8success…

Q: The null hypothesis in a correlated t test is that the population mean difference score is 0. True…

A:

Q: A repeated-measures, a matched-subjects, and an independent-measures study all produce a t statistic…

A: From the provided information, A repeated-measures, a matched-subjects, and an independent-measures…

Q: Ackerman and Goldsmith (2011) report that students who study from a screen (phone, tablet, or…

A: The following data is given, Sample size (n) = 16, Sample mean (M) = 72.5, Population mean (μ) = 77,…

Q: ased on information from a previous study, r1 = 38 people out of a random sample of n1 = 105 adult…

A: Introduction: Denote p1, p2 as the true population proportions of people who believe in…

Q: On average, a sample of n = 36 scores from a normal population with σ = 10 will provide a better…

A: Given n1=36 Standard deviations=10 n2=9

Q: Public relation companies conducted two surveys about deodorants. The first survey asked a random…

A: Solution:

Q: A sample of n = 4 scores is selected from a population with μ = 50 and σ = 12. If the sample mean is…

A: Given datan = 4μ = 50 and σ = 12, sample mean M= 56z-score is given by

Q: Public relation companies conducted two surveys about deodorants. The first survey asked a random…

A: From the provided information,

Q: According to a certain government agency for a large country, the proportion of fatal traffic…

A: Solution: Given information: n= 109 Sample size of  traffic fatalities . p0= 0.34 Population…

Q: A sample of n = 9 scores has SS = 200. What is the variance for this sample?

A:

Q: carnival game is designed so that approximately 10% of players will win a large prize. If there is…

A: Given X=19 N=100 P=0.19 Alpha=0.05

Q: Annie is concerned over a report that "a woman over age 40 has a better chance of being killed by a…

A: The z test is one of the important large sample tests, which is used to study the equality of means…

Q: A sample of 4 scores has a variance of s2 = 64. What is the estimated standard error for the sample…

A: Standard Error:  Standard error gives the accuracy of a sample mean by measuring the…

Q: Based on information from a previous study, r1 = 30 people out of a random sample of n1 = 107 adult…

A: Here is given that r1 = 30    r2 = 46    n1 = 107   n2 = 107 we will find proportions of both…

Q: Based on information from a previous study, r1 = 38 people out of a random sample of n1 = 106 adult…

A:

Q: A researcher conducts an independent-measures study comparing two treatments and reports the t…

A: Solution: Given information: Test statistic t(25) = 2.071 α=0.05  Level of significance

Q: For a population with μ = 80 and σ = 6,what is the z-score corresponding to X = 68?

A:

Q: Based on information from a previous study, r1 = 39 people out of a random sample of n1 = 105 adult…

A: The test statistic for the difference of proportion is, Z=p1-q1P^(1-P^)1n1+1n2wherep1 and p2=sample…

Q: Members of the homeowners' association (HOA) want to know whether more than 45% of homeowners from a…

A: Type I error: In hypothesis testing the Type I error is said to be committed when true null…

Q: Based on information from a previous study, r1 = 37 people out of a random sample of n1 = 97 adult…

A: The proportion of adult Americans who did not attend college believe in extraterrestrials is, Thus,…

Q: To evaluate the effect of a treatment, a sample is ob- tained from a population with a mean of u=…

A:

Q: To evaluate the effect of a treatment, a sample is obtained from a population with a mean of μ = 25,…

A: GivenThe population mean μ=25sample mean M=27.4sample sum of squares SS=64sample size n=9 The null…

Q: A major credit card company is interested in the proportion of individuals who use a competitor’s…

A:

Q: Q2 A new battery supposedly with a charge of 1.5 volts actually has a voltage with a uniform…

A: Given,      A new battery supposedly with a charge of 1.5 volts      actually has a voltage…

Q: If a researcher reports a t-statistic with df = 18, how many individual subjects participated in the…

A: Given: Df = 18

Q: Annie is concerned over a report that "a woman over age 40 has a better chance of being killed by a…

A: Solution: Given information: n= 457 Sample size women  x= 24 women report they are being married now…

Q: A repeated measures study using a sample of n=32 participants would produce a t statistic with df=…

A: Given problem is : A repeated measures study using a sample of n=32 participants would produce a t…

Q: In a previous year, 61% of females aged 15 and older lived alone. A sociologist tests whether this…

A: According to our guidelines we can answer only first question and rest can be reposted.

Q: Are sexually active teenagers any better informed about AIDS and other potential health problems…

A: Consider that, µ1, µ2, and µ3 define the mean number of teens who are sexually inactive, sexually…

Q: Based on information from a previous study, r1 = 34 people out of a random sample of n1 = 105 adult…

A: Given  r1=34, n1=105, r2=50, n2=105  p1^=r1/n1  p2^=r2/n2

Q: If there are 4 scores per group and the t value is 2.34, what is the p value for a two-tailed test…

A: Note: Thank you for the question. Since it is given that, there are 4 scores per group we are…

Q: Public relation companies conducted two surveys about deodorants. The first survey asked a random…

A: Solution: Given information: n1= 500 Sample size of men n2= 550 Sample size of women p1^= 0.68…

Q: A carnival game is designed so that approximately 10% of players will win a large prize. If there is…

A: P-value = 0.0027

Q: A scrap metal dealer claims that the mean of his cash sales is 'no more that R80', but an Internal…

A: Solution: The given claim is that mean cash sales is no more than R80. From the given information n=…

Q: Two different types of injection-molding machines are used to form plastic parts. A part is…

A:

Q: A cigarette manufacturer claims that his cigarettes have nicotine content that does not exceed 2.0…

A: The descriptive analysis is conducted using EXCEL. The software procedure is given below: Enter the…

Q: To evaluate the effect of a treatment, a sample of n= 8 is obtained from a population with a mean of…

A:

Q: Public relation companies conducted two surveys about deodorants.  The first survey asked a random…

A: The number men (n) is 500.

Q: A two-sided t-test for a population mean is conducted with H0:  = 80. If a 99 percent t-interval…

A: Confidence intervals use data from a sample to estimate a population parameter. Hypothesis tests use…

Q: = 8 and

A: Here it is given that - n=4 ∑X=8 ∑X2 = 40

Q: From a population of 500 elements, a sample of 225 elements is selected. it is known that the…

A:

Q: Annie is concerned over a report that "a woman over age 40 has a better chance of being killed by a…

A:

2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.