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 college entrance exam company determined that To achieve this goal, the company recommends that…

A: a) Let μ be the population mean math score on the college entrance exam. The claim is that students…

Q: Does this provide evidence that the proportion of UCD students who are left-handed differs from the…

A: Given : n=240 , X=30 , p0=0.10 , α=0.05 Here , we want to test the claim that the proportion of UCD…

Q: 3. Sommer (1999) investigated student satisfaction with distance learning. One grot of students took…

A: Let Sample 1 : Internet Sample 2 : Classroom First we need to know whether the population variances…

Q: OA. Ho:p=0.29 H:p>0.29 OB. Ho: p=0.29 H;:p#0.29 OC. Ho: p=0.29 H:p<0.29 OD. Ho: p#0.29 H:p=0.29…

A: Here , we are testing whether the percentage of blue candies is equal to 29% This would be a two…

Q: Suppose 221 subjects are treated with a drug that is used to treat pain and 53 of them developed…

A:

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: Suppose 212 subjects are treated with a drug that is used to treat pain and 52 of them developed…

A: Correct answer: Option (B)

Q: Suppose 204 subjects are treated with a drug that is used to treat pain and 55 of them developed…

A:

Q: Suppose that in a random selection of 100 colored​ candies, 22​% of them are blue. The candy company…

A: sample size(n)=100 sample proportion(p^)=0.22 significance level(α)=0.01

Q: in a clinical trial of a drug intended to help people stop smoking, 126 subjects were treated with…

A: The power of the test, in this case, is 1—β= 0.95 (that is, the complement of β), indicates the…

Q: Suppose that in a random selection of 100 colored​ candies, 30​% of them are blue. The candy company…

A: Given information n = 100 coloured candies p-hat = 0.30 p = 25% Claim :- Percentage of blue candies…

Q: Suppose that in a random selection of 100 colored candies, 30% of them are blue. The candy company…

A: Suppose p is the true proportion of blue candies.

Q: Suppose that in a random selection of 100 colored​ candies, 29​% of them are blue. The candy company…

A: B.H0​:p=0.2     H1​:p≠0.2

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: In a survey of 240 students in an elementary statistics class at the University of California-Davis…

A: Given that : n=240                      x=19 (Left handed) x=221 (Right handed) By using one sample…

Q: Suppose that in a random selection of 100 colored​ candies, 21​% of them are blue. The candy company…

A: Suppose that in a random selection of 100 colored​ candies, 21​% of them are blue. The candy company…

Q: A researcher wondered if the currently believed global male-births proportion value approximately…

A: Given Information: Population proportion (po) = 0.512  Sample size = 1000 Sample proportion =…

Q: null and alternative hypotheses for this test. Chc p=0.20 P#0.20 op=0.20 1:p>0.20 o:p=0.20 ip0.20…

A: Hypothesis are H0 : p=0.20 H1 : p&gt;0.20 option B is the correct answer  p^= 52217 p^ = 0.24

Q: Since an instant replay system for tennis was introduced at a major​ tournament, men challenged 1438…

A: The random variable calls follows binomial distribution. There are two independent samples which are…

Q: A national publishing house claims that 35% of all weekly magazine readers inSouth Africa read their…

A: Null Hypothesis: H0: The proportion of all weekly magazine readers in South Africa read their…

Q: Suppose that in a random selection of 100 colored​ candies, 25​% of them are blue. The candy company…

A: Given Suppose that in a random selection of 100 colored​ candies, 25​% of them are blue. The candy…

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&gt;0.25 The…

Q: Researchers claimed that women exercise at the same proportion as men do. To test this claim, a…

A: For the given data Perform Z test for two proportions

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: Identify the null and alternative hypotheses for this test. Choose the correct answer below.

A:

Q: Suppose 231 subjects are treated with a drug that is used to treat pain and 51 of them developed…

A: From the provided information,Sample size (n) = 231From which 51 developed nausea, sample proportion…

Q: Suppose that in a random selection of 100 colored​ candies, 22​% of them are blue. The candy company…

A:

Q: how should a decision that fails to reject the null hypothesis be​ interpreted?

A: The dean of a major university claims that the mean number of hours students study at her…

Q: Suppose 235 subjects are treated with a drug that is used to treat pain and 54 of them developed…

A: given dat,n=235x=54p^=xn=54235=0.2298

Q: Suppose 240 subjects are treated with a drug that is used to treat pain and 55 of them developed…

A: Suppose p is the true proportion of users who developed nausea.

Q: Suppose 247 subjects are treated with a drug that is used to treat pain and 52 of them developed…

A: Given: Sample size (n) = 247 Number of subjects developed nausea (x) = 52 Hypothesized proportion…

Q: Suppose 214 subjects are treated with a drug that is used to treat pain and 54 of them developed…

A: From the provided information,Sample size (n) = 214From which 54 developed nausea.Sample proportion…

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.