1,029 Answered Questions for the topic Statistics Question

Statistics Question Statistics

10/04/17

The value of the test statistic is?
The claim is that the proportion of peas with yellow pods is equal to 0.25 (or 25%). The sample statistics from one experiment include 400 peas with 82 of them having yellow pods. Find the value of... more
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Statistics Question

10/04/17

The value of t* for a 95% confidence interval when there were 15 pieces of data is
I don’t understand this and need help please. 
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Statistics Question

10/03/17

given the class "10 but less than 20" what are the class boundaries?
 If the class is like this 10 but less than 20 20 but less than 30 30 but less than 40   what are the class boundaries
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Statistics Question

10/01/17

If the variance of a data set is 10.32, what is its standard deviation ? Please be accurate to two decimal places.
i need help with these word problems i just do not get them
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Statistics Question

10/01/17

Need answer and explanation!!! PLEASE HELP!
Cans of regular soda have volumes with a mean of 13.46 oz and a standard deviation of 0.12 oz. Is it unusual for a can to contain 13.82 oz of soda?Minimum "usual" value equals = ?.? oz (Type an... more
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Statistics Question Statistics Stats Statistics Formula

10/01/17

how do I solve this?
74 566 681 852 1173 1262 1552 1645 1762 1846 1860 1946 2038 20y=31.934+(-0.304)x An ecologist uses the line, based on 13 colonies, to predict how many new birds will join another colony, to which... more
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Statistics Question

10/01/17

. What percentage of scores fall between -1 and +1 standard deviation units on a normal curve
How would I come to determine this?
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Statistics Question Math Statistics Probability

09/28/17

If ​P(B)=0.4​, P(A|B)=0.5, P(B′​)=0.6, and​ P(A|B′)=0.7, what is P(B|A)?
Statistics probability problem. I could really use some help figuring out how to solve this.
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Statistics Question

09/28/17

x has a normal distribution with a mean of 75.0 and a standard deviation of 2.5
x has a normal distribution with a mean of 75.0 and a standard deviation of 2.5
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Statistics Question

09/27/17

Find the expected gain or loss.
You buy a lottery ticket to a lottery that costs $10 per ticket. There are only 100 tickets available to be sold in this lottery. In this lottery there are one $485 prize, two $100 prizes, and four... more
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Statistics Question

09/25/17

If you draw a card with a value of four or less from a standard deck of cards, I will pay you $59. If not, you pay me $14.
If you draw a card with a value of four or less from a standard deck of cards, I will pay you $59$⁢59. If not, you pay me $14$⁢14. (Aces are considered the highest card in the deck.)
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Statistics Question

09/25/17

Word Problem
The five-number summary for midterm scores {number of points; the maximum possible score was 50 points} from an intro stats class is : Min 16.5, Q1 32, Median 39, Q3 43.5, Max 48.5. Would you... more
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Statistics Question

09/24/17

Suppose X ∼ B ( 1 0 , 0 . 2 ) X∼B(10,0.2). then what is the probability that X is less than 2
 need to know about the formula which will be applied in the above question to find its probability
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Statistics Question Statistics Stats

09/24/17

(a) What percent of the runners have heart rates above 143? (b) What percent of the nonrunners have heart rates above 143?
In a study of exercise, a large group of male runners walk on a treadmill for 6 minutes. Their heart rates in beats per minute at the end vary from runner to runner according to the N(106,... more
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Statistics Question Statistics Stats

09/23/17

(a) The point z with 65% of the observations falling below it (b) The point z with 25% of the observations falling above it
Use Table A to find the value z of a standard Normal variable that satisfies each of the following conditions. (Use the value of z from Table A that comes closest to satisfying the condition.) In... more
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Statistics Question Statistics Stats

09/23/17

What percent of adults would qualify for membership? (Enter your answer to one decimal place.)
The scores of adults on an IQ test are approximately Normal with mean 100 and standard deviation 13. An organization requires an IQ score of 126 or higher for membership. 
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Statistics Question Statistics Standard Deviation

09/19/17

find the randomly selected adult that has an iq between 83 and 115
Assume that adults have iq scores that are normally distributed with a mean of 100 and a standard deviation of 15 .
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Statistics Question Statistics Distribution

09/19/17

Which of the following is NOT a requirement?
Which of the following is NOT a requirement for using the normal distribution as an approximation to the binomial distribution?   Choose the correct answer below.   A.The sample is the result... more
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Statistics Question

09/19/17

A thief steals an ATM card and must randomly guess the correct five​-digit pin code from a 10​-key keypad. Repetition of digits is allowed. What is the pr
A thief steals an ATM card and must randomly guess the correct five-digit pin code from a 10-key keypad. Repetition of digits is allowed. What is the probability of a correct guess on the first try?
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Statistics Question

09/18/17

The average grade for a math test was 79 with a standard deviation of 6.5. (a) If the grades are normally distributed, estimate what percentage of grades is bet
I'm not sure how to do this. please help
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Statistics Question

09/18/17

Assume the random variable X has a binomial distribution with the given probability of obtaining a success.
Assume the random variable X has a binomial distribution with the given probability of obtaining a success. Find the following probability, given the number of trials and the probability of... more
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Statistics Question Statistics Statistic Stats

09/17/17

can someone explain how to get the percentage?
Scores on the Wechsler Adult Intelligence Scale (WAIS) are approximately Normal with mean 97 and standard deviation 14. People with WAIS scores below 69 are considered intellectually disabled when,... more
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Statistics Question Statistics Stats Statistics Method

09/17/17

can someone explain how to get the percentage?
The scores of adults on an IQ test are approximately Normal with mean 110 and standard deviation 17. An organization requires an IQ score of 144 or higher for membership. What percent of adults... more
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Statistics Question

09/17/17

scores of an iq test have a bell shaped distribution with a mean id 100 and a standard deviation of 20. use the empirical rule to determine the percentage of pe
scores of an iq test have a bell shaped distribution with a mean id 100 and a standard deviation of 20. use the empirical rule to determine the percentage of people has an iq score between 60 and 140
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Statistics Question Statistics Stats Probs And Stats

09/16/17

What percent of women over 20 have upper arm lengths less than 32.9 cm?
The upper arm length of females over 20 years old in a country is approximately Normal with mean 35.1 centimeters (cm) and standard deviation 2.2 cm. Use the 68-95-99.7 rule.
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