8,529 Answered Questions for the topic statistics
Statistics
1d
The combined SAT scores for the students at a local high school are normally distributed with a mean of 1485 and a standard deviation of 298.
The combined SAT scores for the students at a local high school are normally distributed with a mean of 1485 and a standard deviation of 298. The local college includes a minimum score of 1574 in...
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Statistics
2d
In her MAT135 class, professor Alayeb found that the mean score of the first exam was 96. Suppose that the scores are normally distributed with a standard deviation of 19 points.
What is the probability that a randomly selected score is less than 71? P(x < 71)=
Statistics
2d
In her MAT135 class, professor Alayeb found that the mean score of the first exam was 96.
what is the probability that a randomly selected score is between 71 and 82 ? ( 71 < x < 82) =
Statistics
2d
The combined SAT scores for the students at a local high school are normally distributed with a mean of 1485 and a standard deviation of 298.
The combined SAT scores for the students at a local high school are normally distributed with a mean of 1485 and a standard deviation of 298. The local college includes a minimum score of 1574 in...
more
Statistics
2d
A company produces steel rods. The lengths of the steel rods are normally distributed with a mean of 133.7-cm and a standard deviation of 0.7-cm.
Find the probability that the length of a randomly selected steel rod is greater than 135.7-cm. P(X > 135.7-cm) =
Statistics
2d
Let represent the full height of a certain species of tree. Assume that has a normal probability distribution with a mean of 99.8 ft and a standard deviation of 5.4 ft.
A tree of this type grows in my backyard, and it stands 100.9 feet tall. Find the probability that the height of a randomly selected tree is as tall as mine or shorter. = IncorrectMy neighbor also...
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Statistics
2d
In her MAT135 class, professor Alayeb found that the mean score of the first exam was 96. Suppose that the scores are normally distributed with a standard deviation of 19 points.
What is the probability that a randomly selected score is less than 71? = What is the probability that a randomly selected score is more than 82? = what is the probability that a randomly selected...
more
Statistics
2d
Let represent the full height of certain species of tree. Assume that is normally distributed with a mean of 41.5 feet and a standard deviation of 39.2 feet
FFind the probability that the full height of a randomly selected tree is greater than 49.3 feet. =
Statistics
2d
A company produces steel rods. The lengths of the steel rods are normally distributed with a mean of 266.8-cm
A company produces steel rods. The lengths of the steel rods are normally distributed with a mean of 266.8-cm and a standard deviation of 2.2-cm.A company produces steel rods. The lengths of the...
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Statistics
2d
Annual high temperatures in a certain location have been tracked for several years.
Annual high temperatures in a certain location have been tracked for several years. Let X represent the year and Y the high temperature. Assume that temperature is independent each year.Based on...
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Statistics
4d
Using your favorite statistics software package, you generate a scatter plot with a regression equation.
Using your favorite statistics software package, you generate a scatter plot with a regression equation and correlation coefficient. The regression equation is reported as y=-91.75x+82.09and...
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Statistics
4d
The following bivariate data set contains an outlier.
The following bivariate data set contains an...
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Statistics
4d
Use linear regression to find the equation for the linear function that best fits the data.
Use linear regression to find the equation for the linear function that best fits this data. Round both numbers to two decimal places.Write your final answer in a form of an...
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Statistics
4d
You run a regression analysis on a bivariate set of data
You run a regression analysis on a bivariate set of data (n=79). You obtain the regression equation y=3.362x+-24.355with a correlation coefficient of r=0.725 (which is significant at a=0.01). You...
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Statistics
8d
In 2006, 10.6% of all live births in the United States were to mothers under 20 years of age.
In 2006, 10.6% of all live births in the United States were to mothers under 20 years of age. A sociologist claims that births to mothers under 20 years of age is decreasing. The sociologist...
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Statistics
8d
In 2006, 10.6% of all live births in the United States were to mothers under 20 years of age.
In 2006, 10.6% of all live births in the United States were to mothers under 20 years of age. A sociologist claims that births to mothers under 20 years of age is decreasing. The sociologist...
more
Statistics
8d
From previous studies, it is concluded that 76% of car crashes occur within 2 miles of the motorists home.
From previous studies, it is concluded that 76% of car crashes occur within 2 miles of the motorists home. A researcher claims it has increased and decides to survey 100 adults. Test the...
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Statistics
8d
An article in the San Jose Mercury News stated that students in the California state university system.
An article in the San Jose Mercury News stated that students in the California state university system take 5 years, on average, to finish their undergraduate degrees. A freshman student believes...
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Statistics Psychology
9d
The mean of the population on variable X is 5.00 and the standard deviation is 1.25. Suppose your value on variable X is 6.25. What is your z-score?
Statistics
9d
From previous studies, it is concluded that 76% of car crashes occur within 2 miles of the motorists home.
From previous studies, it is concluded that 76% of car crashes occur within 2 miles of the motorists home. A researcher claims it has increased and decides to survey 100 adults. Test the...
more
Statistics
9d
In 2006, 10.6% of all live births in the United States were to mothers under 20 years of age.
In 2006, 10.6% of all live births in the United States were to mothers under 20 years of age. A sociologist claims that births to mothers under 20 years of age is decreasing. The sociologist...
more
Statistics
9d
An article in the San Jose Mercury News stated that students in the California State University
An article in the San Jose Mercury News stated that students in the California state university system take 5 years, on average, to finish their undergraduate degrees. A freshman student believes...
more
Statistics
9d
At most 68% of people mind if others smoke near a building entrance.
At most 68% of people mind if others smoke near a building entrance. Express the null and alternative hypotheses in symbolic form for this claim (enter as a percentage).
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