According to securelist, 71.8% of all email sent is spam. A system manager at a large corporation believs that the percentage at his company may be 80%. he examines a random sample of 500 emails received at an email server, and finds that 382 of the messages are spam. a. State the appropriate null and alternate hypotheses. b. Compute the test statistic z. c. Using a=0.5 can you conclude the percentage of emails that are spam differs from 80%?

Q: A researcher designs an experiment in which the single independent variable has five levels. If the…

A: Given A researcher designs an experiment in which the single independent variable has five levels.…

Q: A statistics student believes that black cars are less likely to receive tickets for moving…

A: It is given that the P-value is 0.24.

Q: One research study of illegal drug use among 12- to 17-year-olds reported a decrease in use (from…

A: Givensample size(n)=1050x=95significance level(α)=0.05

Q: To test the fairness of law enforcement in its area, a local citizens' group wants to know whether…

A: Here We have write the null and alternative hypothesis

Q: Many people believe that criminals who plead guilty tend to get lighter sentences than those who are…

A:

Q: One study claimed that 86% of college students identify themselves as procrastinators. A professor…

A:

Q: To test the fairness of law enforcement in its area, a local citizens' group wants to know whether…

A:

Q: A 2018 poll of 3619 randomly selected users of a social media site found that 2463 get most of their…

A: given data (a) claim : p ≠ 0.5n = 3619x = 2463α = 0.05p^ = xn = 24633619 = 0.6806

Q: Classify the hypothesis test as two-tailed, left-tailed, or right-tailed. In 1994, the average…

A: We have to find type of test ..

Q: Based on past experience, a hiring manager believes that less than one-third of applicants are…

A:

Q: Many people believe that criminals who plead guilty tend to get lighter sentences than those who are…

A:

Q: A publisher reports that 69%  of their readers own a particular make of car.  A marketing executive…

A: From the provided information,A publisher reports that 69% of their readers own a particular make of…

Q: A state’s Department of Commerce reports that 82 percent of all small businesses that applied for a…

A: The margin of error is, E = 0.0525, If the prior information is unknown, assume the value of sample…

Q: To test the fairness of law enforcement in its area, a local citizens’ group wants to know whether…

A: Given Information:   Ticketed Not Ticketed Men 35 144 Women 22 199

Q: To test the fairness of law enforcement in its area, a local citizens’ group wants to know whether…

A: The significance level, α=0.02 The given data is,   Ticketed Not Ticketed Men 19 74 Women 11…

Q: One study claimed that 86 % of college students identify themselves as procrastinators. A professor…

A: Answer Sample size [n] =139favorable cases [x] =110

Q: In a random sample of soldiers who fought in the Battle of Preston, 774 soldiers were from the New…

A: The hypotheses are given below: Null hypothesis: H0:p=0.25 Alternative hypothesis: H1:p>0.25 The…

Q: In a clinical trial of a drug intended to help people stop​ smoking, 131 subjects were treated with…

A: Power of the test =0.96Level of significance=0.05

Q: est the hypothesis that the proportion of airplane accidents due to pilot error is not 0.51. Use a…

A: a. The following null and alternative hypotheses for the population proportion needs to be tested:…

Q: An exercise science student believes that during professional rugby games the average distance…

A: Provided that : When reviewing game statistics the student found that the average distance covered…

Q: To test the fairness of law enforcement in its area, a local citizens’ group wants to know whether…

A:

Q: To test the fairness of law enforcement in its area, a local citizens’ group wants to know whether…

A: Answer  Sample size [n1] =28+152 =180 sample size [n2] =20+200 =220 X1 =28 x2=20 sample proportion1…

Q: Suppose a chef claims that her meatball weight is less than 3 ounces, on average. Several of her…

A: Claim is that the meatball weight is less than 3 ounces  significance level(α)=10%=0.10 sample…

Q: Suppose that in a recent poll, 550 of the 915 randomly selected U.S. adults agreed with the…

A: Sample size Out of which  agreed with the statement "social media sites like Facebook and Twitter do…

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.