The manager of the Postal Services claims that 98 percent of their mail are delivered on time. He wants to test at the 1% significance level to determine whether the true proportion is less than 98 percent. iv. State the decision rule.

Q: Q12. If 150 households were surveyed out of which 120 households have internet fiber cable, then…

A: Given Data: x=150-120=30 n=150

Q: of parents of children in high school felt it was a serious problem that high school students were…

A: Three conditions:1. Random: The sample is selected randomly, the first condition is satisfied.2.…

Q: At the 2% level of significance, what is the decision?

A: Given : n1=10 , n2=10 , s1=22.4 , s2=12.0 , α=0.02 Our aim is to find the decision. Here , we use…

Q: Out of 300 students in the school, 225 passed an exam. What would be the mean of the sampling…

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Q: In a sample of 550 students, 80% prefer online resources versus printed materials. The standard…

A:

Q: In general terms, describe the procedure used to perform the Sign Test when testing for equal means…

A: Before performing any test, we need to make sure that the data follows the following assumptions:…

Q: How large a sample should be surveyed to estimate the true proportion of college students who surf…

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Q: A Seattle consumer agency believes that plumbers’ rates are too high and wants to estimate the mean…

A: GivenConfidence Interval(c)=95%Margin of Error(E)=3%=0.03Let…

Q: What is the difference between sample means and a distribution of sample proportions?

A: Given : Sample mean : Average of sample observations is known as "sample mean". Sample proportion :…

Q: What is the percentile for Colorado, where 10.1% of the residents are aged 65 and olde

A: From the stem plot, we can see that only 4 of the 50 states (7.0%,8.8%,9.8% and 10.0%) having…

Q: which statistic is equivalent to dividing the sum of scores equally across all members of a sample

A: The statistic measures the characteristics of samples to estimate the population.

Q: what is the 95th percentile in the t-distribution if the sample size is 25?

A: Given Information: n=25Type of distribution=t distributionTo calculate=95th percentile

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

A:

Q: Test the claim that the proportion of people who own cats is larger than 50% at the 0.025…

A: Let p denotes the population proportion of people who owns cats. The claim of the test is that the…

Q: The owner of a local bar specializing in alternative music wanted to determine the average age of…

A: t 95% confidence level, the z value is 1.96 which can be obtained by using the standard normal…

Q: i) Test, at the 3% level of significance, whether the proportion of adults who experience an adverse…

A: For sample 1, we have that the sample size is N1= 733 the number of favourable cases is X1= 103, so…

Q: f children in high school felt it was a serious problem that high school students were not being…

A: Given: n= 800 p=0.46Now, np = 800* 0.46=368 >10 (Greater than 10) n(1-p) = 800* (1-0.46)=432 >…

Q: Use the first 30 data values in Table 1. Test, at the 5 percent level of significance, the…

A: (a) The hypothesis to be tested for men and women's mean cholesterol is given as-…

Q: a. Determine the sample proportion, p, of college students who own shares of stock. b. If the…

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

A:

Q: Martha wanted to find out the perceptions of Grade 12 learners in Homeschooling. She randomly…

A: Hey there! Thank you for posting the question. Since there are multiple questions posted, we will…

Q: The mean of the sampling distribution of the sample mean is smaller than the mean of the…

A: According to Central limit theorem, when repeated sample of size n is drawn from a population with…

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

A: Solution: From the given information, confidence level is 0.96, p=0.54 and E=0.02.

Q: estimate the sample size

A: An estimate of sample size: The appropriate sample size for estimating the mean of a variable from…

Q: What is the value of the standard score for the sample proportion?

A: If mean if the proportion us P And standard deviation is √(pq/n) Then standard score or Z score for…

Q: 3. A Gallup poll conducted in 2010 found that 494 of 1050 adult Americans believe it is the…

A: Given that  Sample size n =1050 Favorable cases x =494 Sample proportion p^=x/n  =494/1050 =0.4705

Q: Suppose you take a sample of 25 Reese's pieces. The proportion of orange is 0.4. What is the p-value…

A: Solution

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

A:

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: Why doesn't it make sense to test the hypothesis that the sample mean is 42?

A: It is given that the hypothesis test is sample mean is 42.

Q: The executives at Sandbachian, Inc., has recently solved their widget crisis, have another problem…

A:

Q: Based on the P-value shown in the picture do you reject or fail to reject the null hypothesis?…

A: The P-value is 0.0238.

Q: The proportion of people that own cats is 80%. A veterinarian believes that this proportion is…

A: Given that, Sample size n=200 Population proportion p=0.80 Sample proportion of people who owned…

Q: a) What proportion of workers answered yes to the survey? b) What was the margin of error?

A: Here, the 95% confidence interval for the proportion of workers that answered 'yes' is (0.62, 0.73).…

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: Does the sample size n affect the mean of all possible sample means? Explain your answer.

A:

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

A:

Q: In a repeated measures design the difference scores are used in the analysis, not the raw scores.…

A:

Q: Consumer Reports did a survey of 1100 adults and found that 565 were unhappy that their food did not…

A: Given, The sample proportion is, The null and alternative hypothesis is:

Q: Twenty years ago, 53% of parents of children in high school felt it was a serious problem that high…

A:

Q: What is the relationship between the p-value for one-sided vs two-sided alternatives? Draw it and…

A: If T is test statistic and T0 is the calculated value, then observed level of significance or…

Q: Explain the relationships among the sample proportion, the number of successes in the sample, and…

A: Sample proportion: The fraction of number of members sampled which have a specified attribute and…

Q: In a small grocery, 23% of the bottled products were sold while 63% of the canned goods were not. If…

A: Solution To find the confidence interval we will use z distribution.

Q: Explain the four steps involved in significance testing?

A: Hypothesis testing can be conducted in two ways: Critical value approach. P-value approach. The…

Q: How could the survey question "Have you ever had a drink of alcohol?" be revised to obtain a valid…

A: Introduction :- We are given one survey question. We have to revise these questions to obtain valid…

Q: What are the steps for Finding Proportions beyond Two Scores?

A: Z-score: Z-score shows how far a score is away from the mean or it shows how standard deviation away…

Q: what happens to the mean as the sample size increases?

A: It is given that the sample size is increasing.

Q: A statistician changes her level of significance from .001 to .05.  What impact will this change…

A: The hypothesis test, will contain two hypotheses: null hypothesis and alternate hypothesis. The…

Q: The sample mean X is a point estimate of the

A: Population is the whole set of observations that are used for study. Sample is the subset of the…