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Statistics

10/03/23

The Acme Company manufactures widgets. The distribution of widget weights is bell-shaped with a mean of 60 ounces and a standard deviation of 6 ounces.

The Acme Company manufactures widgets. The distribution of widget weights is bell-shaped with a mean of 60 ounces and a standard deviation of 6 ounces. Using the Empirical Rule, answer the... more

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Statistics

10/03/23

A company has a policy of retiring company cars.

A company has a policy of retiring company cars; this policy looks at number of miles driven, purpose of trips, style of car and other features. The distribution of the number of months in service... more

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Statistics

10/02/23

best predicted weight

Listed below are the overhead widths (cm) of seals measured from photographs and weights (kg) of the seals. Find the regression equation, letting the overhead width be the predictor (x)... more

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Statistics

10/02/23

best predicted weight

Listed below are the overhead widths (cm) of seals measured from photographs and weights (kg) of the seals. Find the regression equation, letting the overhead width be the predictor (x)... more

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Statistics

10/02/23

find the regression equation

Find the regression equation, letting the first variable be the predictor (x) variable. Using the listed lemon/crash data, where lemon imports are in metric tons and the fatality rates are per... more

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Statistics

10/02/23

The lengths of pregnancies in a small rural village are normally distributed with a mean of 268 days and a standard deviation of 13 days.

In what range would we expect to find the middle 95% of most lengths of pregnancies? Round the answer to one decimal place

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Statistics

10/02/23

Probability Distribution Function (PDF) for a Discrete Random Variable

A local bakery has determined a probability distribution for the number of cheesecakes that they sell in a given day. X=#sold 0 5 10 15 Probability 0.1 0.21 0.04 ...? 0.13 What is the... more

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Statistics

10/02/23

If you pick 11 fruits at random, then 7% of the time, their mean weight will be greater than how many grams?

A particular fruit's weights are normally distributed, with a mean of 758 grams and a standard deviation of 14 grams.If you pick 11 fruits at random, then 7% of the time, their mean weight will be... more

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Statistics

10/01/23

Statistics; conditional probability

Tests for tuberculosis like all other diagnostic tests are not perfect. QFT-G is one of such tests for tuberculosis. Suppose that for the population of adults that is taking the test, 5% have... more

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Statistics

09/28/23

statistics math

a study was conducted of pleas by 3200 criminals. Among those criminals 2960 pled guilty and 1332 of them were sentenced to prison. among remaining criminals who pled not guilty 195 were sent to... more

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Statistics

09/28/23

Advanced Statistics

Suppose that A is a 2 × 2 Wishart distributed random matrix (i.e., A ∼ Wp (n, Σ) with p = 2 and n ≥ 2). Prove using elementary methods that det(A) is distributed like det(Σ) times two independent... more

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Statistics Probability

09/28/23

Understanding a Piecewise Probability Density Function and Deriving Its CDF

I have a piecewise Probability Density Function (PDF) defined as follows:h(x) = { 0 if x < 1 1.5 * (x - 1)^2 if 1 <= x < 2 1.5 * (3 - x)^2 if 2 <= x < 3 0 if... more

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Statistics

09/27/23

Stats Help Homework

A company produces steel rods. The lengths of the steel rods are normally distributed with a mean of 181-cm and a standard deviation of 0.8-cm.Find P61, which is the length separating the shortest... more

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Statistics

09/26/23

A fire department in a rural county reports that its response time to fires is

A fire department in a rural county reports that its response time to fires is approximately normally distributed with a mean of 22 minutes and a standard deviation of 3.9 minutes. Use the... more

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Statistics

09/25/23

binomial probabilities

A high school baseball player has a 0.163 batting average. In one game, he gets 9 at bat. What is the probability he will get at least 6 hits in the game? Round your answer to four places.

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Statistics

09/25/23

binomial probabilities

A local county has an unemployment rate of 7.9%. A random sample of 17 employable people are picked at random from the county and are asked if they are employed. The distribution is a binomial.... more

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Statistics

09/25/23

standard diciation

Suppose that grade point averages of undergraduate students at one university have a bell-shaped distribution with a mean of 2.542.54 and a standard deviation of 0.420.42. Using the empirical rule,... more

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Statistics

09/25/23

Explain what that means using everyday language

Here's a statement about the coefficient of determination from the book:Approximately 44% of the variation (0.4397 is approximately 0.44) in the final-exam grades can be explained by the variation... more

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Statistics Probability

09/23/23

You toss a fair coin 4 times. What is the probability that: a. you get all Tails? b. you get at least one Head?

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Statistics Probability

09/23/23

In a large population, 60% of the people have been vaccinated. If 3 people are randomly selected, what is the probability that AT LEAST ONE of them has been vaccinated?

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Statistics Probability

09/23/23

A dice is rolled 4 times. What is the probability of showing a 2 on every roll?

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Statistics

09/22/23

Company XYZ know that replacement times for the quartz time pieces it produces are normally distributed with a mean of 10.9 years and a standard deviation of 1.5 years.

Company XYZ know that replacement times for the quartz time pieces it produces are normally distributed with a mean of 10.9 years and a standard deviation of 1.5 years.Find the probability that a... more

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Statistics Biology

09/22/23

How would you perform a chi-square analysis?

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Statistics

09/22/23

What reading separates the highest 0.92% from the rest? That is, if P(Z>c)=0.0092, FIND C

Assume that the readings at freezing on a batch of thermometers are normally distributed with a mean of 0°C and a standard deviation of 1.00°C.A single thermometer is randomly selected and tested.... more

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Statistics

09/22/23

What is the P95 score for this population?

In a certain school district in a large metropolitan area, the SAT scores over that past five years are normally distributed with a mean of 1463. Furthermore, Q3 is 1663. What is the P95 score for... more

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The Acme Company manufactures widgets. The distribution of widget weights is bell-shaped with a mean of 60 ounces and a standard deviation of 6 ounces.

A company has a policy of retiring company cars.

best predicted weight

best predicted weight

find the regression equation

The lengths of pregnancies in a small rural village are normally distributed with a mean of 268 days and a standard deviation of 13 days.

Probability Distribution Function (PDF) for a Discrete Random Variable

If you pick 11 fruits at random, then 7% of the time, their mean weight will be greater than how many grams?

Statistics; conditional probability

statistics math

Advanced Statistics

Understanding a Piecewise Probability Density Function and Deriving Its CDF

Stats Help Homework

A fire department in a rural county reports that its response time to fires is

binomial probabilities

binomial probabilities

standard diciation

Explain what that means using everyday language

You toss a fair coin 4 times. What is the probability that: a. you get all Tails? b. you get at least one Head?

In a large population, 60% of the people have been vaccinated. If 3 people are randomly selected, what is the probability that AT LEAST ONE of them has been vaccinated?

A dice is rolled 4 times. What is the probability of showing a 2 on every roll?

Company XYZ know that replacement times for the quartz time pieces it produces are normally distributed with a mean of 10.9 years and a standard deviation of 1.5 years.

How would you perform a chi-square analysis?

What reading separates the highest 0.92% from the rest? That is, if P(Z>c)=0.0092, FIND C

What is the P95 score for this population?

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