# statistics/mean and standard deviation

25,894 results, page 4

### probability and Stats

How can I find standard error from each of the following: a) a proportion & a sample size? b) mean, standard deviation, and sample size? c) mean & standard deviation? thank you

### statistics

Heights of women have a bell-shaped distribution with a mean of 158 cm and a standard deviation of 8 cm. Using Chebyshev’s theorem, what do we know about the percentage of Women with heights that are within 3 standard deviations of the mean. What are the minimum and maximum ...

### Statistics

Central tendency is to ________ as mean is to standard deviation. This is in a crossword puzzle. _ _ R _ A _ _ _ _

### statistics

If sample number is 1,000 and mean is 7.2 on a scale from 1-10 how do I determine standard deviation.

### statistics

Assume that a population is normally distributed with a mean of 100 and a standard deviation of 15.

### statistics

What is the standard deviation of a normal distribution, whose mean is 35, in which an x-value of 23 has a z-score of -1.63?

### Statistics

Use this information to calculate the mean and standard deviation of this random variable. P(x)- .25, .05, .55, .15

### Statistics

How does the standard deviation differ to of the sample mean x bar. Please help I'm confused

### Essentials of statistics

A populations of scores forms a normal distribution with a mean of 40 and a standard deviation of 12 what is the probability of selecting a sample of n=9 scores with a mean less than m=34

### Statistics

For a sample group of 22, the mean is 86 with a standard deviation of 5. What is the 90% confidence interval of the true mean of the sample? Can you please explain the steps you used to get the answer. Thanks.

### statistics

a. A random sample of 25 was drawn from a normal distribution with a standard deviation of 5. The sample mean is 80. Determine the 95% confidence interval estimate of the population mean.

### Statistics

Construct a 95% confidence interval for population mean: My friends measured 40 fish and found that the mean length of the fish sampled was 3.7 cm with a standard deviation of 0.5 cm.

### Statistics

A sample of size 16 is taken from a normally distributed population with a mean of 12 and a standard deviation of 3. The probability that the sample mean is equal to 12 is a. 1 b. 0.5 c.-0.5 d.0 please explain

### statistics

worried about customer complaints and potential lawsuits, the manufacterers decided that no more than o.5% of bags of Crunchy corn chips should be underweight. there are 2 possible adjustments that can be made; change the mean setting on the filling machines while leaving the ...

### Stat

An SRS of size n is taken from a large population whose distribution of income is extremely right-skewed and the mean income is calculated. Which of the following statements is false? a) When n > 30, the sampling distribution of is approximately normal. b) When n increases...

### Math

I have a problem on standard deviation, and I will need some help with it. Problem: Each professor in an English class give an A to students scoring above 90 and a F to those scoring below 60. Professor 1 has a normal distribution with a mean of 74 and standard deviation 7 ...

### statistics

Cholesterol levels of adult males are approximately normally distributed with a mean of mg/dL and a listed standard deviation of . Some researchers claim that the standard deviation of cholesterol levels of adult males is less than . Suppose that we want to carry out a ...

### Statistics

The Tyco Video Game Corporation finds that it is losing income because of slugs used in its video games. The machines must be adjusted to accept coins only if they fall within set limits. In order to set hose limits, the mean weight of quarters in circulation must be estimated...

### statistic

Two samples each of size 25 are taken from independent populations assumed to be normally distributed with equal variances. The first sample has a mean of 35.5 and standard deviation of 3.0 while the second sample has a mean of 33.0 and standard deviation of 4.0. The pooled (i...

### Math - PreCalc (12th Grade)

Which statement about a uniform probability distribution defined on a given interval is true? A) The mean is always 0. B) The mean is always 1. C) The standard deviation is always 1. D) The mean is the midpoint of the interval. E) The standard deviation is equal to the width ...

### statistics

assuming that you wished to have the highest possible score on an exam relative to ht e other scores, would you rather have a score of 70 on a test with a mean of 60 and a standard deviations of 5.2 or a score of 81 on a test with a mean of 79 and a standard deviation of 7.1?

### statistics

Data from the latest census was analyzed. It was determined that one-parent households spend less on food away from home that do two-parent households. The mean amount spent by 30 one-parent households is $1876 and the standard deviation is $113. The mean amount spent by 30 ...

### statistics

Jack’s ACT score is 30. Jason’s SAT score is 950. Who did better? The mean SAT score is 1000 with a standard deviation of 100 SAT points. The mean ACT score is 22 with a standard deviation of 3 ACT points

### Statistics

Assume there are two lakes containing trout and the weights of the trout in each lake are normally distributed. The distribution of trout weight in Lake A has a mean of 18 ounces with a standard deviation of 2 ounces. The distribution of trout weight in Lake B has a mean of 19...

### statistics

question- a packaging device is set to fill detergent powder packets with a mean weight of 5 kg .the standered deviation is known to be 0.01kg.these are known to drift upward over a period of time due to machine fault,which is not tolerable.a random sample of 100 packets is ...

### Statistics

New data is added to change the mean time to 6 mninutes and 10 seconds with standared deviation 2 minutes and 5 seconds. The mean depth is now 115.5 feet with standard deviation 31.6 feet. If the association is still negative and r^2=.68, find the slope of the regression line ...

### Statistics

The level of nitrogen oxides (NOX) in the exhaust of a particular car model varies with mean 0.9 grams per mile and standard deviation 0.15 grams per mile . (a) What sample size is needed so that the standard deviation of the sampling distribution is 0.01 grams per mile ?

### Statistics

he level of nitrogen oxides (NOX) in the exhaust of a particular car model varies with mean 0.7 grams per mile and standard deviation 0.19 grams per mile . (a) What sample size is needed so that the standard deviation of the sampling distribution is 0.01 grams per mile ?

### university of phoenix

if someone scored two standard deviations above the mean on a standard test where the mean =100 and the standard deviation = 15, what is the person's numerical score?

### statistic

1. A distribution has a standard deviation of 12. Find the z-score for each of the following locations in the distribution. a. Above the mean by 3 points. b. Above the mean by 12 points. c. Below the mean by 24 points. d. Below the mean by 18 points. For the following ...

### Statistics

find the 90% confidence interval for the variance and standard deviation of a sample of 16 and a standard deviation of 2.1 Assume the variable is normally distributed.

### Statistics

How do you figure this out? For a population that has a standard deviation of 10, what is the standard deviation of the distribution of means for samples of size 2? A-6.33 B-7.07 C-2 D-3.03

### statistics

IQ scores distribution of IQ scores is not normally distributed standard with a mean of 100 and a standard deviation of 15, which is represented by a bell-shaped graphical. What is the area under the curve? What is the median? What is the mode?

### statistics

IQ scores distribution of IQ scores is normally distributed standard with a mean of 100 and a standard deviation of 15, which is represented by a bell-shaped graphical. What is the area under the curve? What is the median? What is the mode?

### STATISTICS

IQ scores distribution of IQ scores is normally distributed standard with a mean of 100 and a standard deviation of 15, which is represented by a bell-shaped graphical. What is the area under the curve? What is the median? What is the mode?

### Statistics

What is the mean and standard deviation of 63.7%? What is the mean and standard deviation of 61.4%? Using the 68-95-99.7 rule, describe the sampling distribution of 63.7% Using the 68-95-99.7 rule, describe the sampling distribution of 61.4%? Please help I am so lost...

### Statistics

What is the mean and standard deviation of 63.7%? What is the mean and standard deviation of 61.4%? Using the 68-95-99.7 rule, describe the sampling distribution of 63.7% Using the 68-95-99.7 rule, describe the sampling distribution of 61.4%? Please help I am so lost...

### statistic

Let's assume there are 3 people in Room A and another 3 people in Room B. The ages of the people in Room A are 25, 25, and 25. The ages of the people in Room B are: 10, 25, and 40. The mean of the ages in both rooms is 25. Does that mean that both room have populations that ...

### statistics

The scores of students on the ACT college entrance examination in a recent year had a normal distribution with a mean of 18.6 and a standard deviation of 5.9. A simple random sample of 50 students who took the exam is selected for study: A) What is the shape, mean, and ...

### Math - Standard Deviation

A General Electric soft white 3-way bulb has an average life of 1200 hours with a standard deviation of 50 hours. Find the probability that the life of one of these bulbs will be between 1150 and 1300 hours. You need to change the times to Z-scores â€” scores given in ...

### Psychology/Statistics

For a population that has a standard deviation of 10, figure the standard deviation of the distribution of means for samples of size - 3. Use the formula sqrt(N^ 2/S)

### Algebra

A supervisor finds the mean number of miles that the employees in a 9the x has a line on top)department live from work. He finds X=2.9 and s=3. Which statement must be true? z376 is within 1 standard deviation of the mean. z37 is between 1 and 2 standard deviations of the mean...

### Statistics

For a population that has a standard deviation of 10, figure the standard deviation of the distribution of means for samples of size 3.

### Statistics

For a population that has a standard deviation of 10, figure the standard deviation of the distribution of means for samples of size- (b) 3.

### statistics

For a population that has a standard deviation of 10, figure the standard deviation of the distribution of means for samples of size 3

### statistics

For a population that has a standard deviation of 10, figure the standard deviation of the distribution of means for samples of size- (b) 3.

### statistics

For a population that has a standard deviation of 10, figure the standard deviation of the distribution of means for samples of size- (b) 3.

### statistics

For a population that has a standard deviation of 10, figure the standard deviation of the distribution of means for samples of size - (b) 3 ?.

### statistics

For a population that has a standard deviation of 10, figure the standard deviation of the distribution of means for samples of size- (b) 3

### statistics

For a population that has a standard deviation of 10, figure the standard deviation of the distribution of means for samples of size- (b) 3.

### statistics

For a population that has a standard deviation of 10, figure the standard deviation of the distribution of means for samples of size- (b) 3.

### statistics

For a population that has a standard deviation of 10, figure the standard deviation of the distribution of means for samples of size- (b) 3.

### statistics

For a population that has a standard deviation of 10, figure the standard deviation of the distribution of means for samples of size 3.

### Statistics

For a population that has a standard deviation of 10, figure the standard deviation of the distribution of means for samples of size: 3

### statistics

For a population that has a standard deviation of q0, figure the standard deviation of the distribution of means for samples of size-(a)2,(b)3,(c)4,(d)9.

### Statistics

A driving machine was employed to hit a sample of 41 each of two different brands of golf balls using the same force each time. The research team measured the distance between the point of impact and where the ball eventually came to rest on the ground. Results are show below...

### Satistics

Monthly incomes of employees at a particular company have a mean of $5954. The distribution of sample means for samples of size 70 is normal with a mean of $5954 and a standard deviation of $259. Suppose you take a sample of size 70 employees from the company and find that ...

### statistics

For a population with a mean of 30 and standard deviation of 6, describe the sampling distribution of the means for samples of N=9.

### statistics

Given a data set with the mean = 44 and the standard deviation = 15, what is the value of the Third Quartile?

### statistics

Sample size is 24, Mean rate of 6.50%, Standard Deviation is 1.20. Calculate 90% of confidence interval

### statistics

what percentage of students studied between 30 and 40 hours? Range 10-50, Mean- 35, standard deviation-5.

### statistics

with a mean of 62 and standard deviation of 12, how would you find a proportion greater than 80 and draw it on a curve?

### Statistics

How large a smaple from a N(80,20) population is needed so that the sampling distribution of the mean has a standard deviation of 1?

### Statistics

How large a sample from N(80,20) population is needed so that the sampling distribution of the mean has a standard deviation of 1?

### statistics

in a distribution of scores with a mean of 1500 and a standard deviation of 250, what is the 95th percentile?

### statistics

Make up 20 hypothetical scores. Determine their mean, median, mode, and standard deviation.

### statistics

Assuming that the data are normally distributed with a mean of 45 and a standard deviation of 3.25, what is the z-score for a value of 40?

### statistics

we have a normal distribution with mean 76 and standard deviation 6.4, find the percent between 69.6 & 76?

### statistics

A random sample of size 36 is taken from a population with mean 50 and standard deviation 5. Find P( < 51.5).

### Criminology Statistics

A given distribution has a mean of 60. A score of 75 had a corresponding z of +2.00. The standard deviation is

### statistics

A random sample of 100 of a population Mean is 31 and standard deviation 22 Approximate probability of 28

### statistics

population with a mean of 110 and a standard deviation of 6, what is the likelihood of a score of 100 or lower

### statistics

You have an observation of 55, a population mean of 48, and a standard deviation of 1.85. Therefore, the z-score would be:

### Statistics

A sample of n=20 has a mean of M = 40. If the standard deviation is s=5, would a score of X= 55 be considered an extreme value? Why or why not?

### statistics

I.use the chebyshev's theorem to find out what percentage of the values will fall between 201 and 257 for a data set with a mean of 229 and standard deviation of 14. II. use the emperical rule to find out two values 68% of the data will fall between for a data set with a mean ...

### Math

Can someone explain what to do for the following question. What percentage of a normal distribution is greater than the mean? Give your answer correct to the nearest percent. What formula is used? Because I have to find also 1 standard deviation of the mean and what percentage...

### statistics

A specific study found that the average number of doctor visits per year for people over 55 is 8 with a standard deviation of 2. Assume that the variable is normally distributed. 1. Identify the population mean. 2. Identify the population standard deviation. 3. Suppose a ...

### Math- Statistics

A random sample of size 36 is to be selected from a population that has a mean μ = 50 and a standard deviation σ of 10. * a. This sample of 36 has a mean value of , which belongs to a sampling distribution. Find the shape of this sampling distribution. * b. Find the ...

### statistics

population mean=42.6 standard deviation=12 n=16 M=34.4. Is this mean a reasonable outcome for a sample of n=16, or is this sample mean very different from what would usually be expected? I obtained a z -score of -2.73. Thus, that would make the sample mean a reasonless outcome...

### statistics

An IQ is designed so that the mean is 100 and the standard deviation is 23 for the population of Normal adults, find the sample size necessary to estimate the mean IQ score of statistics students Such that it can be said with 90% confidence that the sample mean is within 5 IQ ...

### Statistics

Thirty random students took a calc test. If the sample mean was 90 & the standard deviation was 13.9, construct a 99% confidence interval for the mean score of all students. Is the answer 83.03 to 96.97??

### Statistics

Suppose that a sample of size 58 is drawn from a population with mean 23 and standard deviation 80. Find the value of , the mean of the distribution of sample means. Wrtie only a number as your answer.

### statistics

. For patients with a certain disease the amount of certain protein in the blood is normally distributed with a mean of 130 and a standard deviation of 5. For patients without the disease the amount of that protein is normally distributed with a mean of 150 and a standard ...

### statistics

For patients with a certain disease the amount of certain protein in the blood is normally distributed with a mean of 130 and a standard deviation of 5. For patients without the disease the amount of that protein is normally distributed with a mean of 150 and a standard ...

### Statistics

A sample of 148 values is randomly selected from a population with mean, μ, equal to 46 and standard deviation, σ, equal to 17. (Give your answers correct to one decimal place.) (a) Determine the interval (smallest value to largest value) within which you would ...

### statistics

A student scores 600 on a SAT test. If the population mean of the test scores is 510 and the population standard deviation is 106 point, what is the student’s deviation from the mean?

### statistics

for a distribution standard deviation=10.If every item is increased by 2 then what will new standard deviation?

### statistics

for a distribution standard deviation=10.If every item is increased by 2 then what will new standard deviation?

### statistics

a research participant has her brain scanned while listening to music and solving math problems, and the brain area of interest has a percent signal change of 58. From many previous studies with this same math-problems procedure (but not listening to music), it is known that ...

### math

find the standard deviation for the following: 8,5, 12, 8, 9, 15, 21, 16, 3. There is a formula but our teacher wants us to do it a specific way. For example, 47, 41, 32, 53, 57. First you find the mean, which is 46 and then subtract it with each number in the set so you get 1...

### Statistics

The law of large numbers tells us what happens in the long run. Like many games of chance, the numbers racket has outcomes so variable - one three-digit number wins $600 and all others win nothing - that gamblers never reach "the long run." Even after many bets, their average ...

### Statistics

The law of large numbers tells us what happens in the long run. Like many games of chance, the numbers racket has outcomes so variable - one three-digit number wins $600 and all others win nothing - that gamblers never reach "the long run." Even after many bets, their average ...

### Statistics

The law of large numbers tells us what happens in the long run. Like many games of chance, the numbers racket has outcomes so variable - one three-digit number wins $600 and all others win nothing - that gamblers never reach "the long run." Even after many bets, their average ...

### Math

On a standardized test, Phyllis scored 84, exactly one standard deviation about the mean. If the standard deviation for the test is 6, what is the mean score for the test?

### math

A district mathematics test for all third graders had a normal distribution with a mean of 74 and a standard deviation of 11. What percentage of the third graders tested scored with +1 and -1 standard deviation of the mean?

### Statistics

A normally distributed population has a mean of 40 and a standard deviation of 12. What does the central limit theorem say about the sampling distribution of the mean if samples of size 100 are drawn from this population.

### Math (statistics)

The probability of obtaining heads on a biased coin is 0.4. The coin is tossed 600 times. a. i. Write down the mean number of heads (240) ii. Find the standard deviation of the number of heads (12) b. Find the probability that the number of heads obtained is less than one ...

### statistics

it is stated that the standard deviation sample of the is 7.6 (n = 26). Test the claim to a significance level of 0.10 that the population standard deviation was greater than 7.0. Round all answers to 3 decimal places.

### statistics

it is stated that the standard deviation sample of the is 7.6 (n = 26). Test the claim to a significance level of 0.10 that the population standard deviation was greater than 7.0. Round all answers to 3 decimal places.