8,972 Answered Questions for the topic statistics

Statistics Chemistry

11/27/22

How statistical tools are used in the field of chemistry?
Write the uses of statistica tools like average, standard deviation, estimation, testing, regression and correlation in the field of chemistry?Really need your help!Please answer as soon as... more
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Statistics Math

11/27/22

I can't understand this i need help badly
In a​ poll, 37​% of the people polled answered yes to the question​ "Are you in favor of the death penalty for a person convicted of​ murder?" The margin of error in the poll was 2​%, and the... more
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Statistics

11/27/22

Statistics Homework
The mean SAT score in mathematics is 541. The standard deviation of these scores is 39. A special preparation course claims that the mean SAT score, μ, of its graduates is greater than 541. An... more
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Statistics Algebra 1

11/26/22

normal distribuitions and standar
The heights of adult men in America are normally distributed, with a mean of 69.8 inches and a standard deviation of 2.64 inches. The heights of adult women in America are also normally... more
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Statistics Math Sat Math

11/25/22

What is the expected profit? ​(Round to the nearest dollar as​ needed.)
A man buys a racehorse for ​$20,000 and enters it in two races. He plans to sell the horse​ afterward, hoping to make a profit. If the horse wins both​ races, its value will jump to $60,000. If it... more
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Statistics

11/23/22

statistics homework
IQ is normally distributed with a mean of 100 and a standard deviation of 15.a) Suppose one individual is randomly chosen. Find the probability that this person has an IQ greater than 95. Write... more
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Statistics

11/23/22

Statistics homework
The patient recovery time from a particular surgical procedure is normally distributed with a mean of 6.4 days and standard deviation of 1.1 days. Use your graphing calculator to answer the... more
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Statistics

11/23/22

Binoimial probability
The Jones family was one of the first to come to the U.S. They had 6 children. Assuming that the probability of a child being a girl is .5, find the probability that the Jones family had:at least 4... more
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Statistics

11/23/22

Confidence Intervals (Mean)
If n = 10, ¯xx¯ = 47, and s = 7, construct a confidence interval at a 80% confidence level. Assume the data came from a normally distributed population. Give your answers to three decimal places. 
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Statistics

11/22/22

Spearman's Rho and Non-Monotone Data
I have used SPSS to calculate Spearman's Rho for ordinal and scale data. No significant correlations were found. However, I am not sure that my data is monotonic and I do not understand how to... more
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Statistics

11/22/22

A news report stated that the mean distance

Going to work: A news report stated that the mean distance that commuters in the United States travel each way to work is 14 miles. Assume the standard deviation is 8 miles. A sample of 70... more
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Statistics

11/20/22

A sample of size 65 will be drawn from a population with mean 22 and standard deviation 15. Find the probability that will be between 21 and 25.
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Statistics

11/19/22

Statistics Normal Distribution
The patient recovery time from a particular surgical procedure is normally distributed with a mean of 3 days and a standard deviation of 1.5 days. Let X be the recovery time for a randomly selected... more
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Statistics Math

11/19/22

Help with confidence intervals (mean)
A researcher is interested in finding a 90% confidence interval for the mean number of times per day that college students text. The study included 106 students who averaged 38.3 texts per day. The... more
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Statistics

11/19/22

Statistics questions

The acme company manufactures widgets. The distribution of a widget weights is bell shaped. The widget weights have a mean of 45 ounces and a standard deviation of 4 ounces.
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Statistics

11/17/22

find the normal distribution
The maintenance department at the main campus of a large state university receives daily requests to replace fluorecent lightbulbs. The distribution of the number of daily requests is bell-shaped... more
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Statistics Math Algebra 2 Sat Math

11/16/22

Can Someone please explain to my grade Predictions
So i currently have 1.5 gpa in a class. I need a 3.0 to pass and these are the only assignments that are left. How well do i have to perform in the remaining assignments order to achieve a 3.0.
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Statistics

11/16/22

Density probability
From this density, the probability that X > 1.04 or X < 0.04 is:
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Statistics

11/15/22

48% of all pets sold at a pet store are dogs. One day, 9 people arrive at the store and purchase pets. (Note: One pet is purchased per person.)

a) what is the probability that exactly 3 of them are dogs? b) if the store only has 5 dogs, what is the probability that they have sufficient dogs for sale that day?
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Statistics Math Probability

11/15/22

The probability function fX for a random variable X is given by the table below.

The probability function fX for a random variable X is given by the table below. x | -1 0 1 2 3 fX(x) = P(X = x)| 0.2 0 u 0.2 0.1 (a) Find u. (b) Find the... more
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Statistics

11/15/22

Plz help me solve this equation
In a certain county there are two radio stations: the Maisha FM and the Jambo FM. A researcher interested in the loyalty to stations of this county found the following:Of those who listen to the... more
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Statistics

11/14/22

Statistics and Probability
According to Masterfoods, the company that manufactures M&M’s, 12% of peanut M&M’s are brown, 15% are yellow, 12% are red, 23% are blue, 23% are orange and 15% are green. (Round your... more
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Statistics

11/13/22

A high school baseball player has a 0.174 batting average. In one game, he gets 6 at bats. What is the probability he will get at least 2 hits in the game?
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Statistics

11/13/22

Central limit theorem

The amount of coffee that people drink per day is normally distributed with a mean of 17 ounces and a standard deviation of 5.5 ounces. 34 randomly selected people are surveyed. Round all answers... more
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Statistics

11/13/22

Testing One-Sample Proportion Hypothesis (Word Problem)
A tyre manufacturer claims that more than 85% of the company’s tyres will last at least 80,000km. In a random sample of 400 tyres, 22 wore out before reaching 80,000km. Do the data support the... more
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