8,958 Answered Questions for the topic statistics

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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Statistics Probability

11/12/22

Help me with this statistics homework please asap
1) 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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Statistics

11/11/22

In a normal distribution
what is the probability that a random sample of 305 with population proportion 0.46 has a sample proportion of between 0.42 and 0.42?
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Statistics

11/11/22

About 6% of the population has a particular genetic mutation. 300 people are randomly selected. Find the mean for the number of people with the genetic mutation in such groups of 300.
About 6% of the population has a particular genetic mutation. 300 people are randomly selected.Find the mean for the number of people with the genetic mutation in such groups of 300.
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Statistics

11/11/22

standard deviation

The national average for mathematicsSATS in 2011 was 514. Suppose that the distribution ofscores was approximately bell-shaped and that the stan-dard deviation was approximately 40. Within... more
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Statistics

11/10/22

probability with replacement
You pick three cards from a deck of 52 cards and putting them back in. What is the probability that you get a Jack, a king, a queen?
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