Questions on The Central Limit Theorem. Standard error. Distribution of sample means answered by real tutors!

Tutors Answer Your Questions about Central-limit-theorem (FREE)

Question 1176929: 1,3,5 are the first three terms of a quadratic sequence the 7th term is 35 determine the 6th and 5th term of the sequence detrrmine the nth term
Click here to see answer by greenestamps(13200)

Question 1178440: Of the members of a Boy Scout troop, 15% have received the first aid merit badge. If 40 boy scouts are selected at random, find the probability that four or more will have the first aid merit badge?

Click here to see answer by ikleyn(52788)

Question 1178567: A sample of size n=11 has a sample mean xbar=15.6 and sample standard deviation s=2.4. Construct a 95% confidence interval for the population mean μ.

Click here to see answer by ewatrrr(24785)

Question 1178568: A random sample of 75 printers discovered that 25 of them were being used in small businesses . Find the 99% limit for the population proportion of printers that are used in small businesses.
Click here to see answer by JimmyJW(2)

Question 1178701: Annual precipitation in a certain city is normally distributed with a mean of 99 inches, and a standard deviation of 18 in. Find the probability that the mean annual precipitation during 35 randomly picked years will be less than 101.8 in.?
Click here to see answer by ikleyn(52788)

Question 1179918: A recent survey indicated that the average amount spent for breakfast by business managers was $7.58 with a standard deviation of $0.42. It was felt that breakfasts on the West Coast were higher than $7.58. A sample of 81 business managers on the West Coast had an average breakfast cost of $7.65. Find the P-value for the test.
Click here to see answer by Theo(13342)

Question 1178691: An advertising firm states that 27% of households will buy something on the Internet next year. How large a sample is needed to be 92% confident that this proportion is within 5% of true proportion.
Click here to see answer by robertb(5830)

Question 1184696: Let Y1, Y2, Y3, and Y4 be independent, identically distributed variables from a population with mean μ and variance σ(squared). let ȳ = 1/4(y1,y2,y3,y4) denote the average of these random variables. What are the expected value and variance in terms of μ and σ(squared)?
Click here to see answer by robertb(5830)

Question 1186868: The mean height of an adult giraffe is 17 feet. Suppose that the distribution is normally distributed with standard deviation 0.9 feet. Let X be the height of a randomly selected adult giraffe. Round all answers to 4 decimal places where possible.

c. What is the Z-score for a giraffe that is 18.5 foot tall?

d. What is the probability that a randomly selected giraffe will be shorter than 17.5 feet tall?

e. What is the probability that a randomly selected giraffe will be between 16.7 and 17.2 feet tall?

f. The 70th percentile for the height of giraffes is
ft.
Click here to see answer by ikleyn(52788)

Question 1190595: SAMPLING DISTRIBUTION WITH AND WITHOUT REPLACEMENT
A population consists of (3,8,10,15). Consider all possible sample size 2 that can be drawn with replacement.
-what is the standard deviation of the sampling distribution of means? =
-what is the population mean? =
-what is the population standard deviation? =
-what is the population variance? =
-what is the variance of the sampling distribution of means? =
-what is the mean of the sampling distribution of means? =

A population consists of (3,8,10,15). Consider all possible sample size
2 that can be drawn without replacement.
-what is the variance of the sampling distribution of means? =
-what is the standard deviation of the sampling distribution of means? =
-what is the mean of the sampling distribution of means? =

Click here to see answer by MathLover1(20850)

Question 1195851: Historically, 93% of the deliveries of an overnight mail service arrive before 10:30 the following morning. If a random sample of 500 deliveries is selected, what is the probability the sample will have more than 95% of the deliveries arriving before 10:30 the following morning?
Click here to see answer by Boreal(15235)

Question 1199283: The area of a rectangle is 46 square inches. If the length is 4 times the width, then find
the dimensions of the rectangle. Round off your answers to the nearest hundredth.

Click here to see answer by josgarithmetic(39618)

Question 1200399: 1. Each child born to a particular set of parents has a probability of 0.25 of having
blood type O. If these parents have 5 children. What is the probability that?
a. Exactly three of them have blood type O.
b. At most 2 have blood type O
c. At least 4 have no blood type O
d. The fifth child have blood type O
e. Compute the mean and variance of this probability distribution
f. Draw the probability distribution table

Click here to see answer by Solver92311(821)

Question 1200674: slope of the tangent line to the curve g(x)=x^2-4/x+2

Click here to see answer by ikleyn(52788)

Question 1200673: lim g(x)=x^2-4/x+2
x->2
Click here to see answer by ikleyn(52788)

Question 1200672: lim f(x)=2x^2-2x^2+3x-3/x-1
x->1
Click here to see answer by ikleyn(52788)

Question 1200671: lim f(x)=2x^2-2x^2+3x-3
x-1
Click here to see answer by ikleyn(52788)

Question 1200670: lim f(x)
x-1
Click here to see answer by ikleyn(52788)

Question 1201121: The mean I.Q of a sample of 1600 children was 99. Is it likely that this was a random sample from a population with mean I.Q 100 and standard deviation 12? (Test at 5% level of significance)
Click here to see answer by math_tutor2020(3817)

Question 1204215: If limt(e^(ln(ax)) × tan(2a/x))= 8 ' find value of a ?
Click here to see answer by MathLover1(20850)

Question 1204215: If limt(e^(ln(ax)) × tan(2a/x))= 8 ' find value of a ?
Click here to see answer by ikleyn(52788)

Question 1205257: 1. An investigator decided to construct a frequency distribution with five classes. The following
information was available. For fifty observations made on a characteristic under study, the
first two and the last two frequencies were 6,10,10 and 6 respectively. Given the last class
mark is 66 and upper class limit of the fifth class is 72.
a. Calculate mean, Median and mode.
Click here to see answer by CPhill(1959)

Question 1190594: A population consists of (3,8,10,15). Consider all possible sample size 2 that can be drawn with replacement.
-what is the standard deviation of the sampling distribution of means? =
-what is the population mean? =
-what is the population standard deviation? =
-what is the population variance? =
-what is the variance of the sampling distribution of means? =
-what is the mean of the sampling distribution of means? =

A population consists of (3,8,10,15). Consider all possible sample size
2 that can be drawn without replacement.
-what is the variance of the sampling distribution of means? =
-what is the standard deviation of the sampling distribution of means? =
-what is the mean of the sampling distribution of means? =

Click here to see answer by CPhill(1959)

Question 1178703: Use the given degree of confidence and sample data to construct a confidence interval for the population proportion p.
Of 82 adults selected randomly from one town, 66 have health insurance. Find a 90% confidence interval for the true proportion of all adults in the town who have health insurance.
Click here to see answer by CPhill(1959)

Question 1165554: lim (x-> -inf) (x^2+4^-x)/(x^2-4^x)
Click here to see answer by ikleyn(52788)

Older solutions: 1..45, 46..90