970 Answered Questions for the topic Statistics Question

05/06/15

Can someone help me with this statistic question?
I have the following problem and can't figure it out. A mileage test is conducted for a new car model, the “Pizzazz.” Thirty random selected Pizzazzes are driven for a month and the mileage is... more
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Statistics Question

05/04/15

What percent of scores on this test will exceed 140?
Scores on a particular intelligence test are essentially normal with mean of 100 and standard deviation of 20. I have a statistics final today and im lost on how to solve this. I need a step by... more
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Statistics Question

05/03/15

more data points
does more data points improve your chances of finding a statistically significant difference
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Statistics Question

05/01/15

standard deviation
The mean daily snowfall amounts for whoville in Dec is 25 in and the standard deviation is 1.5 in assuming the data is normally distributed how many days would you expect the daily snowfall to be... more
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Statistics Question

04/29/15

distribution percentiles
suppose that the distribution of scores on an exam is closely described by a normal cure with mean 100. the 16th percentile of this distribution is 80. what is the 84th percentile?
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Statistics Question

04/28/15

Find the probability
A student takes a 15-question, true/false exam and guesses on each question. Find the probability ofpassing if the lowest passing grade is 12 correct out of 15. Would you consider this event likely... more
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Statistics Question

04/21/15

It is claimed that the average income in a particular community is $45,000.
It is claimed that the average income in a particular community is $45,000. The standard deviation of that income is known to be $4,000. A sample of 49 individuals is selected, and a sample mean of... more
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Statistics Question

04/20/15

the lengths, in feet, of various bridges are 88, 251,275,354,and 1,121. Name any outliers in the data set
this is a homework question about measures of variation, and im very confused.
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Statistics Question

04/19/15

Give a reason for conducting an experiment with two factors.
Give a reason for conducting an experiment with two factors.
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Statistics Question

04/18/15

what is the probability of getting eithier the sum of 8 or atleast one four in the roll of a pair of dice
This is a probability question and there are several more like this one
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Statistics Question

04/17/15

An ice cream parlour sells tubs of ice cream.
An ice cream parlour sells tubs of ice cream. Each tub is advertised as containing no less than 1.50 litres. A sample of 20 tubs is selected; the sample mean and standard deviation were determined... more
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Statistics Question

04/16/15

It is claimed that the average income in a particular community is $45,000
It is claimed that the average income in a particular community is $45,000. The standard deviation of that income is known to be $4,000. A sample of 49 individuals is selected, and a sample mean of... more
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Statistics Question

04/16/15

What is the number of degrees of freedom associated with the t-test, when data are gathered from a matched-pairs test with 20 pairs?
What is the number of degrees of freedom associated with the t-test, when data are gathered from a matched-pairs test with 20 pairs? a. 18 b. 19 c. 20 d. 38
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Statistics Question

04/15/15

Statistics need answer before 1:35 CST
The chance you have cancer is 1/100.There is a cancer test.The probability that the test will read yes if you DO have cancer is 90%.The probability that the test will read positive if you do not... more
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Statistics Question

04/14/15

true or false - An interval estimate may or may not contain the value of the parameterbeing estimated.
this is a statistics 125 test. im having trouble finding the answer
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Statistics Question

04/14/15

Below is a hypothesis test set up
Below is a hypothesis test set up by a student who recently took introductory statistics:   Ho: x = 5Ha: x ≠ 5   The sample mean of 100 cases used to implement the hypothesis test is x =... more
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Statistics Question

04/14/15

The population mean height of a basketball player is 200 cm
1.      The population mean height of a basketball player is 200 cm with a standard deviation of 15 cm. In a sample of 40 basketball players, what is the probability of getting a sample mean height... more
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Statistics Question

04/14/15

1. A bank has determined that the monthly balances
1.      A bank has determined that the monthly balances of customers' savings accounts are normally distributed with an average of $1,350 and a standard deviation of $250. What percentage of... more
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Statistics Question

04/14/15

A week in october the average temperature was 6 degrees celcius. The median was 5 degrees celcius. What was the typical value?
A week in october the average temperature was 6 degrees celcius. The median was 5 degrees celcius. What was the typical value?
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Statistics Question

04/14/15

How many of the classes 27 students got more than 20 points?
The class had a math test where max you could get was 40. The most successful student got 38 points. The classes mean was 21, and the classes median was 20. How many of the classes 27 students got... more
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Statistics Question

04/13/15

A sample of 16 items had a mean of 30.
A sample of 16 items had a mean of 30. It is assumed that the population mean is 35 and the population standard deviation is 7. What is the z-value associated with this sample mean? a. -2.86 b.... more
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Statistics Question

04/13/15

The scores for a group of high school students in a national physics examination were
The scores for a group of high school students in a national physics examination were normally distributed with a mean of 86 and a standard deviation of 4. If there were 97,680 students with scores... more
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Statistics Question

04/13/15

What is the probability that a continuous random variable x will assume any specific value?
What is the probability that a continuous random variable x will assume any specific value? a. 0.0 b. 0.5 c. 1.0 d. There is not enough information provided to determine the probability.
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Statistics Question

04/13/15

If the z-value for a given value of x
If the z-value for a given value of x of the random variable x is z = 2.12 and x is normally distributed with a mean of 70 and a variance of 25, to what x-value does this z-value correspond?
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Statistics Question

04/09/15

Z-scores abd normal distribution
Z-scores are used to interpret scores from any normal distribution or ratio scores. I was asked if the Z=0. Do you knw the answer?
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