Twenty years ago, 57% of parents of children in high school felt it was a serious problem that high school students were not being taught enough math and science. A recent survey found that 287 of 750 parents of children in high school felt it was a serious problem that high school students were not being taught enough math and science. Do parents feel differently today than they did twenty years ago? Use the a= 0.05 level of significance.

Q: The failure rate for taking the bar exam in Philadelphia is 41%.  If 375 people take the bar exam,…

A: Given that, The failure rate for taking the bar exam in Philadelphia is 41%  i.e. probability, p =…

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: In a large data set, the 49th percentile is 523 and the 71st percentile is 675.  About what…

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Q: much does the mean score tell you about the performance of the whole class?

A: Averages are tools of summarizing data, it facilitates the comparison. Different averages are…

Q: Illustrate the Test R2 for significance?

A: Coefficient of determination: The coefficient of determination (r2) is the percentage of total…

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: Using the table, the predictor "Harsh parenting" had a t test value that equaled 3.465 and its p…

A: The hypothesis is, Null hypothesis: H0: There is no mean difference between the low-mindful…

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

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Q: An analysis was conducted to determine whether the average height of the 25 girls in the same class…

A: To test whether the average height of 25 girls is different from the general population of 15-year…

Q: t is the value of the mean?

A: What is the value of the mean?

Q: How do you create a new scale as a mean score by creating a new variable that adds up all the scores…

A: Mean is generally represented as total sum of all observations divided by number of observations.…

Q: Is veganism more common than it used to be? In 2012, it was reported that 2% of Americans were…

A: The random variable adults living in the United States in 2019 who are vegan follows normal…

Q: What is the z-score corresponding to the 74th percentile

A: Standard normal distribution: The standard normal distribution is a special case of normal…

Q: Explain Testing a Single Mean for significance?

A: Z-test for significance of a single mean: The z-test is appropriate when population standard…

Q: accounting examination is 26, how large a sample is needed to estimate the true mean score within 6…

A: HERE GIVEN , n = ??? population standard deviation  =  26  confidence level  = 99%

Q: What type of test would you use to determine if happiness and health are related?

A: Test is that whether happiness and health are related.

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: Juan scored 10 points higer on his midterm and 47 points higher on his final than he did  on his…

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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: An analysis was conducted to determine whether the average height of the 25 girls in the same class…

A: Here Avg height of 25 girls in the Same class is difference from population mean is checked Here…

Q: A researcher wants to determine whether there is an association between weight and scores on the…

A: Given: R-value = 0.213 P-value = 0.3

Q: What is the percentile rank x=15 and what is the score for 75th percentile?

A: If the we have no of scores is 15 then we have formula for percentile rank as:…

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: A historian examining British colonial records for the Gold Coast in Africa suspects that the death…

A: The proportion of African that died is p1=x1n1=24534002=0.007205459 The proportion of Europeans that…

Q: An article reported that 73% of companies have Twitter accounts. An economist thinks the percentage…

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Q: In a survey, the median household income in a country was found to be £27000, and the mean household…

A: Given: Mean=53000Median=27000

Q: Only about 10% of all people can wiggle their ears. Is this percent different for millionaires? Of…

A: Here use single proportion z test Only about 10% of all people can wiggle their ears. Is this…

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

A: The value of p0 is 0.52 and the sample size n is 800.

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

A: Given: p = 0.52 n = 750 x = 235 Sample proportion, p^ = x/n = 235/750 = 0.3133 α = 0.1

Q: What is the multiplier for an interval that estimates the proportion with  a. 88% confidence?  b.…

A: Confidence Interval: The form of the confidence interval is, CI = Point estimate ± Margin of error…

Q: A Harriss poll taken surveyed 2016 adults and found that 423 of them had one or more tattoos. can…

A: The hypotheses for the test is given below.Null hypothesis:H0: p = 0.25Alternative hypothesis:H1: p…

Q: What well-being score represents the 45 percentile? *

A: It is given that the mean is 100 and the standard deviation is 20.

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: What is the multiplier for an interval that estimates the proportion with (a) 88% confidence? (b)…

A: a) In the confidence interval that estimates the proportion, critical value is the multiplier. The…

Q: lllustrate the relation between the Significance Level and power?

A: Power of a test: The power of test is the correct decision. The probability that not occurring the…

Q: A Verizon researcher compared the number of text messages sent by a sample of teenage boys to the…

A: a) In this case, the Verizon researcher compared the number of text messages sent by a sample of…

Q: In a sample of 20 men, the mean height was 178 cm. In a sample of 30 women, the mean height was 164…

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Q: The cighth grade girls' basketball team played a total of 13 games this season. If they scored a…

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Q: The mean score on a test is 75, the median score is 80, and the mode score is 85.  Pat got an 82.…

A: Given: The mean score on a test is 75, the median score is 80, and the mode score is 85.

Q: Suppose that the mean score of a class of 34 students was 78. The 17 male students in the class had…

A: The mean score of class of 34 students was 78.

Q: Warren wants to know if the amount of coffee that you drink is related to the number of hours that…

A: In the given case the test of the significance of correlation coefficient which is based on the…

Q: What is the level of significance?

A: It is given that the sample size n is 15.

Q: A Pew poll taken in 2010 surveyed 830 people aged 18-29 and found that 166 of them had one or more…

A:

Q: A historian examining British colonial records for the Gold Coast in Africa suspects that the death…

A: The number of samples extracted from the population is the sample size. When the sample size 30 or…

Q: Which is the correct output (B or C) for the appropriate test? Explain.

A: A student compared organic food price at Grocery1 and Grocery2 here we use Paired t-test for…

Q: Espahol A nationwide job recruiting firm wants to compare the annual incomes for childcare workers…

A: Given : Claim : Tthe mean annual income of childcare workers in Utah is less than the mean annual…

Q: In a survey of 500 cigarette smokers, 39 of them reported that they have tried hypnosis therapy to…

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Q: What do you think would help students pay more attention in class?

A: Here we want to know bias in survey question or not.

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…

Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.