If you double the sample size in a poll, what effect does that have on the margin of error? By what factor should the sample size in a poll be increased in order to cut the margin of error in half?

Q: In tilapia fish farming, 5 tons of high-quality feed resulted in a weight gain of 5,000 lb. What is…

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Q: For a population with  σ = 8,  X=13 and a z-score = 2.21, find the value of µ

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Q: the base of a rectangle is increased by 20% and the altitude is decreased by 10% by what percentage…

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Q: How large the sample size should be in order to be 98 percent confident, if the sample proportion is…

A: Given data, p=0.78 E=0.16 z-value at 98% confidence is Zc=2.326 n=?

Q: In a condo complex, 2/3 of the men were married to 3/4 of the women. What is the ratio of married…

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Q: Nick makes the first quartile salary for an actuary and Dylan makes the first quartile salary for a…

A: From the given box plot:   First quartile for CPA salary= $35,000   First quartile for Actuary…

Q: A coin rushes 10 times. What are the chances of 3 to 6 rounds?

A: The problem explains us that a coin rushes 10 ,now we have to calculate the chances of 3 to 6…

Q: What is the measure of ZDC'?

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Q: Suppose r is .84, compute proportion of variation is explained?

A: From the given information, it is observed that r=0.84.

Q: In a sample of 45 men, 27 said that they had less leisure time today than they had 10 years ago. In…

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Q: A group of preschoolers has 25 boys and 21 girls. What is the ratio of girls to boys?

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Q: Expressed as Percantage of selling price, which of the best selling menu items is the most costly to…

A: We have to answer question based on given table.

Q: What is the scale factor

A: Here we have to find the Scale factor,

Q: If you answered 40 problems correctly on a 42​-question ​test, what percent of the problems did you…

A: Answer: Percent of problems answered correctly is given by    %C = No. of correct answers (n)total…

Q: Researchers conducted a survey among 400 doctors to ask the question; "Are you willing to treat your…

A: Given Sample size, n = 400  For a conservative case, we assume that the proportion of  patients…

Q: A boutique wants to determine how the amount of time a customer spends browsing in the store affects…

A: It is given that the A scatter plot between the Amount spent (in dollars) and the Browsing time (in…

Q: At a competitive examination at which 600 graduates appeared, boys outnumbered girls by 96.

A: It is asked to find the number of boys who qualified for the interview. Let's assume,  N = Total…

Q: What proportion of the variation in y can be explained by the variation in the values of x?

A: Here we have given the regression equation Y = 64.21X+ 44.09 and the correlation coefficient, r =…

Q: 1. What is the value of 3ª? 2. How many times bigger is 315 compared to 312?

A: 1. value of 34 2. Comparison between 315and 312

Q: In a sample of 47 men, 36 said that they had less leisure time today than they had 10 years ago. In…

A: We have to perform test for difference in two proportion.

Q: Which type of flour costs the least per pound?

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Q: The test statistic for the rhino data, x^2= 3.85, suggests that:

A: Given that, The test statistic for the rhino data, x^2= 3.85,

Q: From the side-by-side boxplots for the heart rate of males and females, do there seem to be any…

A: Box plot is used to  detect whether the outliers presented in the data (or) not and to compare the…

Q: A firm produces bolts whose length x is normally distributed with a Me = 78.3 mm and a SD = 1.4mm.…

A: Given information- Population mean, µ = 78.3 mm SD = 1.4 mm Let X be the length of the bolt produces…

Q: A recent polls show that 61% of adult Americans are comfortable with the legalization of marijuana,…

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Q: The trunk diameter, in centimeters, of a certain variety of pine tree is represented by X~N(150,…

A: We have to find out the z-score for a tree with a diameter of 170 centimeter..

Q: In a multiple-step calculation, is it better to round off the numbers to the correct number of…

A: We are asked that which is better -to round off  the number in every step to the correct number of…

Q: if you answer 36 problems correctly on a 42 question test what percentage of the problems did you…

A: if you answer 36 problems correctly on a 42 question test what percentage of the problems did you…

Q: Paradise Resort has a total of 350 lounge chairs. If 210 chairs are under umbrellas, what percent of…

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Q: One week in the midwest, 3.4 inches of snow fell on Monday, 0.6 inches on Tuesday, 2.2 inches on…

A: Let the amount of snow on Friday = x inches  So the total amount of snow=…

Q: In a certain company the ratio of men to women is 5:3. What is the fraction of employees that are…

A: Given that the ratio of men to women is 5:3

Q: Green Coffee revealed that the ratio of customers who purchase different coffee-based drinks:…

A: Given: Number of drinks that are sold in a day = 630 Ratio for coffee is given as 4:9:7:6 Sum is:…

Q: The owner of a book shop surveyed people who bought fantasy novels to see if the store should expand…

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Q: Why does the use of multiple t tests increases?

A: The multiple t-tests are defined for a one-sample multivariate test and as well as for two samples.…

Q: Why are there more old animals in shelters than young ones?

A: The given question is why there are more old animals in shelters than young ones In larger animal…

Q: The property managers of Oakridge Apartments recently oversaw the installation of a new swimming…

A: Out of 100 residents 82 were satisfied

Q: What is the scale factor ?

A: Given ,  We have to find scale factor

Q: If you spend 4 hours a week studying for English and 4.5 hours studying for math what is the ratio…

A: If spending 4 hours a week studying for English and 4.5 hours studying for math, to find what is the…

Q: Q5. Briefly explain four factors often used to subdivide life in mortality statistics.

A: Mortality of a population is a measure of the rate of death among that population. Mortality of a…

Q: Could you give a background question where 12! would be the answer?

A: Please find the explanation below. Thank you

Q: What is the value of SS for this sample?

A: Given: n = 4  Σ X = 4 Σ X 2 = 32 The formula to calculate the SS is as follows:

Q: What is the Scale factor

A: The old coordinates B=(0,2), C=(3,0) So the length of BC=(0-3)2+(2-0)2=9+4=13 The new coordinates…

Q: You would like to be 99.9 confident that your estimate is within 2% of the true population…

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Q: A nursing school professor is interested in determining how her college students compare to the…

A: Let X denote the exam score, then assuming that X is normally distributed with mean, µ = 100 and a…

Q: A survey shows that 3 out of 4 of those drink coffee in a town with a population is 7900 adults how…

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Q: A business department is trying to determine if their program is competitive. They survey recent…

A: Given information: The MINITAB output results for the one-same t test is given.

Q: If 6units get 50% and 50units get 25%, how much percentage does 27 get?

A: If 6units get 50% and 50units get 25%, how much percentage does 27 get?

Q: A bicycle manufacturer observes that the number of bike paths in a city affects the number of…

A: here take  x= no. of bike paths y= no. of bicycle sold here compute the regression line and then for…

Q: In a biology study, the appearance of an animal when carrying a certain gene is recorded. Assume…

A: We have to find the number of animals having Gene B.

Q: Students surveyed boys and girls separately to determine which sport was enjoyed the most. After…

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Contingency Table

A contingency table can be defined as the visual representation of the relationship between two or more categorical variables that can be evaluated and registered. It is a categorical version of the scatterplot, which is used to investigate the linear relationship between two variables. A contingency table is indeed a type of frequency distribution table that displays two variables at the same time.

Binomial Distribution

Binomial is an algebraic expression of the sum or the difference of two terms. Before knowing about binomial distribution, we must know about the binomial theorem.