The standard deviation of a variable is 15. If a sample of 100 individuals is selected, what size sample is needed to cut the standard deviation of the mean in half? a) 50 b) 200 c) 400 d) 25

Q: From the five-number summary 7, 13, 17, 21, and 43 determined after the students took the exam,…

A: We know that the Five number summary of a dataset gives us 5 things about a dataset as the minimum…

Q: Illustration : The mean and standard deviation of a set c 100 observations were 40 and 5 respective…

A: Mean is the average value of given observations. For a set of 'n' observations, mean is the sum of…

Q: The standard deviation of a 1500 volume population is 54'cm. In the case of "non-refundable…

A:

Q: The symbol u, represents the mean of a sample of size n. True False

A:

Q: Calculate the standard deviation of a distribution with: n = 15, f= 110 = 1235 77 O 9.364 O 7.333 O…

A: Given,n=15∑ix.f=110∑ix2 .f=1235

Q: The average life of Canadian women is 73.75 years and the standard deviation of the women's life…

A: Let X represent the random variable   Mean=73.75 SD=6.5

Q: A bottled water distributor wants to d nationally known water bottling com standard deviation of the…

A: Solution

Q: The mean and standard deviation of the sample mean is given by Mean= Hx = µ = 2560 Standard…

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Q: How many times n a balanced coin must be flipped to get a standard deviation of the number of tails…

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Q: Set A has a standard deviation of 2 and Set B has a standard deviation of 5. Which statement is…

A: Solve the following

Q: Given the mean and standard deviation of a normally distributed set of scores, determine the…

A: Given that  x = 35 ,  μ = 18 , ? = 7

Q: Find the sample size needed for 99% confidence with a margin error within +10W/m² and ±5W/m². Assume…

A: Given Information: Confidence level is 99% i.e., 0.99 Margin of error E1=±10 Margin of error E2=±5…

Q: Given are 3 observations for the monthly profits (in 1000s) for a group of small businesses. Monthly…

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Q: The length of one pencil is measured with a ruler, the following measurements are obtained; 5.33 cm,…

A: Consider the obtained measurements when a pencil is measured by a ruler 5.33 cm, 5.58 cm, 5.45 cm,…

Q: The weights of all newborn babies are normally distributed with a mean of 8 pounds and a standard…

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Q: d. What is the probability that the sampling error made in estimating the population mean salary of…

A:

Q: 1. Using the formulas, compute the mean and standard deviation of this sample of scores.  45 58 63…

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Q: b- Find out which is more dispersion variable (X) or variable (Y). if the Arithmetic Mean and the…

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Q: The table shows the distribution of sizes of uniforms in UPANG. Calculate the standard deviation of…

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Q: For a distridution Bowley's coefficient of skewness is – 0.56, Q = 16.4 and median = 24.2. What is…

A:

Q: n pulse rate​ (in beats per​ minute) of adult males is equal to 69 bpm. For a random sample of 164…

A: As the population standard deviation is not known, we will use t distribution.

Q: Computes, the sample s.d. for the data set.

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Q: The appropriate interval width for a random sample of 100 observations that fall between 50 and 250…

A: The number of classes is given by Sturge's formula n=1+3.322log(N)=1+3.322*log(100)=7.644≈8 Interval…

Q: A random sample of 14 married couples had their heights measured with the following results (X=man's…

A: Use Excel or any other software to draw the scatterplot.Steps of Excel:1. Enter the data.2. Go to…

Q: ith a mean of 110 and standard dev. of 15, find the 3 unique deviations to the left and right of the…

A: Deviations to the left   i) One standard deviation away from mean x = u - s x = 110 - 15 = 95   ii)…

Q: Length Area 37 53 30 45 25 30 25 39 43 60 31 49 43 60 38 57 What is the lower…

A: Regression line are used to predict the future variable. Prediction interval are used to predict the…

Q: Given that s.e.(b) = 61 and the estimate is 32, what is the t-stat?

A: GivenSEβ=61Estimate(β)=32

Q: The standard deviation of a population of 10000 volume is 62cm. In the case of "non-refundable…

A: The formula for sample size for a given confidence interval and population standard deviation is:

Q: An engineer wishes to determine the width of a particular electronic component. If she knows that…

A: We have given that Margin of error (E) = 0.4 Standard deviations (σ) = 1.9 Significance level (α) =…

Q: With 95% confidence, what is the margin of error when estimating a population mean when n = 100 and…

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Q: In using cusum chart with n=1, the process standard deviation should be estimated in a way similar…

A: Since we have to model standard deviation in cusum chart, we can use Xbar and S charts.

Q: d. Compute the first and third quartiles. e. Which measure, the mean or median, is a better measure…

A: The data can be sorted in ascending order as: 28, 29, 30,39, 41, 48, 48, 49, 51, 62

Q: d the population standard deviation for the number of smallmouth bass caught per day by each nt…

A: The formula to compute the population standard deviation is,

Q: Suppose a set of test scores is appproximately bell-shaped, with a mean of 68 and a range of 60.(a)…

A: a). It is given that the test scores are approximately bell shaped with mean 68 days and range of…

Q: According to the central limit theorem, if a sample of size 56 is drawn from a population with a…

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Q: b. He would like the sample mean to be within 1 square inch of the population mean, with probability…

A: Here use normal distribution

Q: A major cab company in Chicago has computed its mean fare from O'Hare Airport to the Drake Hotel to…

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Q: Given that the mean μ=20 and the standard deviation σ=4, find P (15 < x < 25)

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Q: Both sets of values have an average of 13. It's Set A's standard deverarion smaller, larger, or…

A: Average of both sets are= 13 The set A has the smallest value=1 and largest value=25  The set B has…

Q: The weights of a certain dog breed are approximately normally distributed with a mean of u = 53…

A: Given: μ = 53σ = 5

Q: The symbol μx¯ represents the mean of a sample of size n. True False

A: The sampling distribution of sample means of size n follow normal distribution with mean and…

Q: One measure of skewness of a distribution is defined by q=

A: Given information: Given that the three quartiles of the data are Q1, Q2 and Q3.

Q: Find the standard deviation for the given data n 64, Σίx, = 44 1 , Σίx? = 495917 ,Σχ, = 188 O a.…

A: SD = n∑f.x2 -∑f.x2n(n-1)

Q: Given Mean = 50, C.V. = 40%, Karl PearsonS Coefficient of Skewness = -0.4 Find standard deviation…

A: According to the given information, we have Mean = 50 Coefficient of variation, C.V. = 40% Karl…

Q: given by ju = 143 b and a standard deviation given by o = 29 lb. (a) ff 1 woman is randomly…

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Q: The mean weight of 1000 students at a certain high school is 140 pounds and the standard deviation…

A: Assuming that the weights are normally distributed.

Q: A distance AB is observed repeatedly using the same equipment and procedures, and the results, in…

A:

Q: Suppose the measurement of 800 items are normally distributed with mean 66 cm and standard deviation…

A: