Of a random sample of 172 elementary school educators, 118 said that parental support was the most important source of a child’s success. Test the hypothesis that parental support is the most important source of a child’s success for at least 75% of elementary school educators against the alternative that the population percentage is less than 75%. Use α = 0.05.

Q: Nationally, the proportion of red cars on the road is 0.12. A statistically-minded fan of the…

A: The following hypothesis can be formed

Q: Let p1 and p2 be the respective proportions of women with iron-deficiency anemia in each of two…

A:

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

A: The random variable X follows normal distribution. We have to test whether the region has a higher…

Q: In a survey of 1000 adult Americans, 45.4% indicated that they were somewhat interested or very…

A:

Q: Step 6 of 6 :   Make the decision to reject or fail to reject the null hypothesis.

A: The sample proportion for first sample is, p^1=x1n1=20210=0.0952 The sample proportion for second…

Q: In a clinical trial, 17 out of 900 patients taking a prescription drug complaint of flu like…

A: From the provided information, Sample size (n) = 900 Out of which 17 patients taking a prescription…

Q: A survey of 90 recently delivered women on the rolls of a county welfare department revealed that 27…

A: Given,n=90x=27p^=xnp^=2790=0.3α=0.05

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

A: Solution: Given information: n= 110 Sample size of traffic fatalities x= 49 traffic fatalities…

Q: In a random sample of 1,250 adult drivers, 450 said that they would cut their driving by 10 percent…

A:

Q: To test the effectiveness of a new drug designed to relieve flu symptoms, 200 patients were randomly…

A: Given data: Significance level = 0.05 Given claim: The proportion of patients who took the drug was…

Q: A magazine conducted a random sample of 800 Americans and asked, "Should the federal tax on…

A:

Q: In a survey of 1000 adult Americans, 45.9% indicated that they were somewhat interested or very…

A:

Q: Lisa wants to determine if graduates from her collegeearn different incomes than do graduates from…

A: Let μ denotes the population mean income of the graduates from Lisa's college. The average income is…

Q: Results from a survey conducted in a certain grocery store showed that 3 out of 5 people preferred…

A:

Q: A large manufacturing company investigated the service it received from its suppliers and discovered…

A: We have been given that, 44% of all material shipments were received late. Thus, p0 = 0.44. ∝ =…

Q: l study, a random sample of 540 participants agree to have their blood drawn, which is to be…

A: The random variable  X which represents the number of samples out of the 10 who have these…

Q: In a survey of 1000 adult Americans, 46.7% indicated that they were somewhat interested or very…

A: From the provided information, Sample size (n) = 1000 Sample proportion (p̂) = 0.467 The hypotheses…

Q: Biologists were studying the proportions of cats that had spotted markings on their fur in two…

A: Correct answer is  (A)

Q: A neurologist is testing the effect of a drug on response time by randomly injecting 100 rats with a…

A: Givensample size(n)=100Mean(x)=1.05sample standard deviation(sd)=0.5α=0.01

Q: A sample of n = 100 scores is selected from a population with u = 100 with o = 30. On average, how…

A: The formula of the standard error of the mean is,

Q: In a National Institute on Alcohol Abuse and Alcoholism survey, 33% of American adults said that…

A: Given: n= 2300 ,x= 805 p= 0.33 ,significance level(∝)= 95.0 p̂= 805 / 2300 =define hypothesis;-

Q: The National Institute of Mental Health published an article stating that in any one-year period,…

A: The hypotheses can be constructed as: Null hypothesis: H0: p = 0.095 Alternative hypothesis: H1: p…

Q: Historically, the proportion of people who trade in their old car to a car dealer when purchasing a…

A: Solution: Given information: n= 115  Sample size  x= 46 success  p^=xn=46115=0.40 sample proportion…

Q: A random sample of 750 registered voters in Phoenix is asked if they favor the use of oxygenated…

A:

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

A: Given Information:  t(25) = 2.071 here,  df = 25  t value = 2.071

Q: An organization published an article stating that in any one-year period, approximately 8.2 percent…

A: Proportion z_test: If the given sample size is more than 30 or Population standard deviation is…

Q: A researcher surveyed 500 people. She found that the individuals who took some form of over the…

A: The study is experimental study. In this type of study , the group is subjected to some treatment…

Q: What would our cutoff Z-score be if we want to do a two-tailed test and use an alpha of .01?

A:

Q: A cream with alpha-hydroxy acid, advertises that it can reduce wrinkles and improve the skin. In a…

A: It is been asked to find the 95% confidence interval for the true population proportion of…

Q: In a survey of 460   drivers from the​ South, 397   wear a seat belt. In a survey of 340…

A: Given Information: Number of drivers surveyed from south, n1 =460. Number of drivers who wear seat…

Q: A researcher conducted a t-test for independent samples to evaluate the mean difference between two…

A:

Q: The manufacturer of a new racecar engine claims that the proportion of engine failures due to…

A: Step 2: n1=135 n2=175 x1=14 x2=8 The sample proportion of p^1 is, p^1=x1n1    =14135   =0.104

Q: 31% of all pygmy softshell tortoises have stripes on their shells. A herpetologist in Cititon…

A:

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

A:

Q: Biologists were studying the proportions of cats that had spotted markings on their fur in two…

A: P-value illustrates the conditional possibility of getting an outcome that is equal to or more…

Q: A randomized controlled trial reports that 2% of the patients in the active treatment group had a…

A: Given detail:   A randomized controlled trial reports that 2% of the patients in the active…

Q: At any age, about 20% of American adults participate in physical conditioning activities at least…

A:

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

A: Given information: According to a government agency for a large country, the proportion of fatal…

Q: A study of 200 randomly selected occupants in passenger cars and 250 randomly selected occupants in…

A: Here, p1 represents the proportion of occupants in passenger cars and p2 represents the proportion…

Q: n a survey of 1000 adult Americans, 45.7% indicated that they were somewhat interested or very…

A: Solution: Given information: n= 1000  Sample size  p^= 0.457  Sample proportion p= 0.50 Population…

Q: In a random sample of  320  cars driven at low altitudes,  50  of them exceeded a standard of  10…

A:

Q: old is p2, what is the null hypothesis for a test to determine if the proportion of the population…

A: A null hypothesis is a statement about an unknown parameter that is framed either from existing…

Q: A seven-year medical research study reported that women whose mothers took the drug DES during…

A: Since you have posted a question with multiple subparts, we will solve first three subparts for you.…

Q: Do vaccines work? I take a sample of 1000 of unvaccinated people exposed outside and determined that…

A: State the hypotheses.

Q: In a sample of 88 children selected randomly from one town, it is found that 8 of them suffer from…

A: Given information- Sample size, n = 88 It is found that 8 of them suffer from asthma. So, x = 8 So…

Q: sample of 100 high income voters and 40 out of a sample of 75 low income voters supported a decrease…

A: Given : x1= 60.0 n1= 100 x2= 40.0 n2= 75 significance level, 0.05

Q: The manufacturer of a new racecar engine claims that the proportion of engine failures due to…

A: Solution: Given information: n1= 115 Sample size of new engine x1= 12 new engine failed n2= 120…

Q: The manufacturer of a new racecar engine claims that the proportion of engine failures due to…

A: Given data : x1= 14.0 n1= 135 x2= 8.0 n2= 175

Q: 3 out of 4 american adults under age 35 have eaten pizza for breakfast. if a random sample of 20…

A: Let the R.V X denotes the number of adults eaten pizza for breakfast and it follows the binomial…

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.