Past studies have indicated that the percentage of smokers is estimated to be about 33%. Given the new smoking cessation programs that have been implemented, you now believe that the percentage of smokers has reduced. You randomly surveyed 1732 people and found that 533 smoke. Use a 0.05 significance level to test the claim that the percentage of smokers has reduced.

Q: In a poll of 1000 adults, 520 said they felt vulnerable to identity theft. Use a 0.05 significance…

A: Given information Total adults(n) = 1000 No of people feeling vulnerable(x) = 520

Q: A graduate student beleves that people consider faces with more contrast between lip color and skin…

A: The given hypothesis is, Null hypothesis: H0: The level of contrast between lip color and skin tone…

Q: In Ontario, chemical accidents account for 1 in 5 workplace accidents. In Que- bec, out of a sample…

A: Introduction: Denote p as the true proportion of workplace chemical accidents in Place Q.

Q: Based on the boxplot and descriptive statistics, which group shows more variability in narcissism…

A:

Q: Listed below are "likability" ratings made by participants in a speed dating session. Use a 0.05…

A: It is required to test whether the male ratings are less than female ratings. The difference between…

Q: You are running a political campaign and wish to estimate, with 95% confidence, the proportion of…

A: Formula for the sample size needed to estimate a population proportion is

Q: The z for a sample mean hypothesis test compares a sample mean to another mean. In these situations,…

A: From the above data We are given that the The z for a sample mean hypothesis test compares a…

Q: A political scientist claims that 38% of first-year college students characterize themselves as…

A: The hypothesized proportion is 0.38, n=500 and x=215.

Q: Does the one observed sample mean qualify as a common or a rare outcome? Explain.

A: Sample mean qualify as a common outcome if the difference between the sample mean and the actual or…

Q: Past records indicate that 45% of students eat breakfast while driving to school. A campaign to…

A: Solution: State the hypotheses Null hypothesis: That is, the proportion of students eats breakfast…

Q: Test the claim that the proportion of men who own cats is larger than 50% at the .025 significance…

A: Given that  Claim :  The proportion of men who owns cats is larger than 50%  Hypothesized proportion…

Q: What proportion of the sample reported that they had been cyberbullied?

A: Givensample size(n)=14795No.of respondents say yes they had been cyberbullied(x1) = 2219No.of…

Q: If a P-value is .043, what does that mean in terms of the value obtained for the test statistic?

A: p-value is the probability of obtaining more extreme results under  null hypothesis, by more extreme…

Q: Twenty years ago, 46% of parents of children in high school felt it was a serious problem that high…

A:

Q: at a 0.10 significance level?

A: No treatment  Fertilizer  Irrigation  Fertilizer and irrigation  1.212 0.939 0.069 0.852…

Q: What measure of central tendency is most appropriate to use if you want to know the passing score if…

A: Mean: It is an “arithmetic” mean. Mean is probably the most familiar average. The mean (of a set of…

Q: It is thought that 12% of all students taking a particular course received a grade of A. In a sample…

A:

Q: Does the data from the sample support his claim at a significance level of 0.05?

A: It is given that Sample size n = 60 Sample mean M = 3012 Sample SD s = 112 Level of significance =…

Q: Consider the following scenario: you want to investigate the relationship between the number of…

A: Here we want to see if there is a relationship between 'likes' on Facebook and 'number of friends'…

Q: If you draw a random sample of 100 scores from a large population of test scores and compute the…

A: As we increase z value, corresponding probability of occurence decreases. hence, The event among…

Q: compared to the median, the mean number of hours that participants watch television is ___.  -lower…

A: The given Statistic is :

Q: intended population

A: A population is the entire group that you want to draw conclusions about   Intended population:…

Q: Twenty years ago, 54% of parents of children in high school felt it was a serious problem that high…

A: From the provided information, Sample size (n) =750 and p0 = 0.54

Q: You have been hired by a consortium of local car dealers to conduct a survey about the purchases of…

A: Given: Confidence level = 95% Margin of error = 0.03 Formula Used: n = ZαMargin of error2 p(1-p)

Q: Would it be unusual to find a pair of samples in which the proportion of males who are left-handed…

A: Consider that n1 and n2 are defined as the sample sizes for males and females, respectively.

Q: Is the proportion of twin births among teenage mothers different from the overall figure?

A: It is given that Sample size n = 469 Number of twin births, X = 7 Level of significance = 10% = 0.10

Q: Are freshmen psychology majors more likely to change their major before they graduate compared to…

A: Given Information :   344 of the 618 freshmen psychology majors from a recent study changed their…

Q: A television sports commentator wants to estimate the proportion of citizens who​ "follow…

A: Given Data: Margin of Error=0.22 p=0.54   z-value=1.96

Q: in a gallup poll of randomly selected adults, 66% said that they worry about identity theft.  For a…

A: Given,         sample size(n) =1013    The probability of an adults said that     They worry about…

Q: Can you reject the claim that the proportion of 18 to 24-year-olds living in their parents' homes…

A: Given that  Sample sizes n1=248 , n2=244 Sample proportion p1^=0.515 , p2^=0.412

Q: At the a Y 0.05 significance level, what is the most appropriate conclusion to draw from this test?

A: To make decisions about hypothesis, we make comparison of p-value and level of significance.

Q: Twenty years ago, 54% of parents of children in high school felt it was a serious problem that high…

A:

Q: Twenty years ago, 47% of parents of children in high school felt it was a serious problem that high…

A: Given that  Sample size n =900 Population proportion p=47%=0.47

Q: Pick a sample problem where despite correlation, causation cannot be reasonable argument.

A: Let us take an example of sales of umbrella and sales of raincoats. Sale of raincoats Sale of…

Q: Twenty years ago, 52% of parents of children in high school felt it was a serious problem that high…

A: The hypothesis tests, contain two hypothesis: null hypothesis and alternate hypothesis. The…

Q: Twenty years ago, 54% of parents of children in high school felt it was a serious problem that high…

A: Given n=850 P0=0.54 so n*P0(1-P0) = 850*0.54*(1-0.54) =211.1

Q: Assume you are using a significance level of a = 0.05| to test the

A: As given,  α = 0.05 We have to test the claim: µ < 20  Sample size ( n ) = 33 µ = 14 and σ = 8…

Q: Twenty years ago, 52% of parents of children in high school felt it was a serious problem that high…

A:

Q: Suppose that an anxiety measure has a mean of 106 and SD of 20. The researcher only wants to work…

A:

Q: Twenty years ago, 52% of parents of children in high school felt it was a serious problem that high…

A: Given : n = 700 p = 0.52

Q: A concerned group of citizens wanted to know if the proportion of forcible rapes in Indonesia was…

A: Solution: Note: Hello! As you have posted more than 3 sub parts, we are answering the first 3…

Q: You are conducting a study to see if the proportion of voters who prefer the Democratic candidate is…

A:

Q: Explain if there was a statistically significant difference between the group means. did you arrive…

A: Test is that whether there was a difference between the three means. Level of significance = 0.01

Q: The manager of a small supermarket chain wants to estimate the proportion of time stockclerks spend…

A: Assume that the population proportion is 0.5. It is known that the critical value for 98% confidence…

Q: You are conducting a study to see if the proportion of voters who prefer the Democratic candidate is…

A:

Q: It is claimed that the mean household size in the River Terrace neighbourhood is 3.5 persons. A…

A: Test is that whether the mean household size in the River Terrace neighbourhood is 3.5.

Q: Traditional statistics (means, variances, and hypothesis tests) are not used to evaluate the results…

A: The traditional statistics are used to evaluate the result means we use the critical values to make…

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.