8,971 Answered Questions for the topic statistics

Statistics

04/03/22

Binomial Distribution: Standard Deviation, am I getting this wrong?
I am testing out a Binomial distributed dataset in excel.The dataset is litterally a "RANDBETWEEN(1;2)" So it simply randomizes between the number 1 and the number 2 on a range of 10.000 cells. The... more
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Statistics

04/01/22

if P(E)= 0.3 and P(F)= 0.4 and P(EunionF) = 0.1 then P(E U F)=
The symbol for the union is the upside down U but I couldn't find it to type it. I am not sure what the formula for this problem is.
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Statistics

03/31/22

A student averages 70% on mult choice tests. What is the probability that he misses the first 3 questions until he gets a question correct?
I think I know the answer I just want to go over it just to make sure that I am doing things correctly. I thought the answer is 30 percent but I am not sure how I am getting this answer.
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Statistics

03/31/22

Confidence Interval
Explain the confidence interval of the slope or b in a simple linear regression, positive vs negative and what this means
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Statistics

03/31/22

Intercept and linear regression

What happens to the intercept if you add variables to the regression model (increase, decrease, remain the same) and why?
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Statistics

03/31/22

probability statistics

The mean daily production of a herd of cows is assumed to be normally distributed with a mean of 40 liters, and standard deviation of 11.6 liters.A) What is the probability that daily production... more
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Statistics

03/31/22

probability statistics
Engineers must consider the breadths of male heads when designing helmets. The company researchers have determined that the population of potential clientele have head breadths that are normally... more
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Statistics

03/31/22

find the probability
Assume that when adults with smartphones are randomly​ selected, 49% use them in meetings or classes. If 25 adult smartphone users are randomly​ selected, find the probability that exactly 15 of... more
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Statistics

03/30/22

A random sample of 150 students has an average test score of 86.28. The standard deviation of the entire school is 10.3. Find the margin of error if c = 0.90.
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Statistics

03/30/22

I am confused solving this problem
A real estate agent claims that 62% of all private residences being built today are 3-bedroom homes. To test this claim, a large sample of new residences is inspected; the proportion of these... more
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Statistics Probability

03/29/22

Probability Statistics
The Acme Company manufactures widgets. The distribution of widget weights is bell-shaped. The widget weights have a mean of 45 ounces and a standard deviation of 5 ounces.Use the Empirical... more
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Statistics Probability

03/29/22

Help with statistics question
The probability density of a random variable X is given in the figure below.From this density, the probability that X > 1.72 or X < 0.14 is: 
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Statistics

03/29/22

E and F are mutually exclusive events. P(E) = 0.5; P(F) = 0.4. Find P(E|F). (Enter your answer to one decimal place.) P(E|F)

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03/29/22

For a standard normal distribution, find: P(z < 2.85) Express the probability as a decimal rounded to 4 decimal places.
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Statistics Probability

03/29/22

A plane lands or takes off, on average once per 45 seconds at an airfield. Calculate what is the probability that in a random selected hour we notice:
1) At least 75 landings or take offs?2) Under 100 landings or take offs?
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Statistics

03/29/22

If one student is chosen at random, Find the probability that the student was full-time AND got a "B".
Giving a test to a group of students, the grades and class-taking status are summarized below A B C Total Full-time 2 18 3 23 Part-time 13 16 14 43 Total 15 34 17 66
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Statistics

03/29/22

The time it takes me to wash the dishes on a randomly selected night is uniformly distributed between 6 minutes and 19 minutes.
The time it takes me to wash the dishes on a randomly selected night is uniformly distributed between 6 minutes and 19 minutes.a) State the random variable in the context of this problem.   rv X =... more
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Statistics

03/28/22

Probability question
If a group of 54 students are randomly broken into 3 groups of 18 students each every school year. What are the odds that any two students will be in the same group for three years in a row? Thanks
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03/28/22

Yummy Creamy is a New York based company that manufactures and distributes ice-cream across tri-state area. The product line includes 2 main flavors – Purple Delight (PD) and Choco- Chips (CC).
Yummy Creamy Is a New York based company that manufactures and distributes Ice-cream across tri-state area. The product line includes 2 main flavors - Purple Delight (PD) and Choco- Chips (CC). On... more
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Statistics

03/28/22

standard deviation
how to find standard deviation
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Statistics Math

03/27/22

Business Statistics.

Consider the hypothesis test below.H0 : p1 -p2 < or = 0Ha : p1-p2 > 0The following results are for independent samples taken from the two populations.sample 1 sample 2n1 = 200 n2 = 300‾p1=... more
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Statistics

03/26/22

b. Find the critical value t a/2 corresponding to a 95% confidence level
TInterval(13.046,22.15)x=17.598Sx=16.01712719n=50
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Statistics

03/26/22

Stats q pls help
Weights of erasers produced by a certain factory are known to follow the uniform distribution between 31.5 g and 32.3 g. (a) (10 points) Erasers produced by this factory are sold in packs of 45. A... more
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Statistics Math Algebra 1 Algebra 2

03/26/22

PLEASE help with statistical probability questions!
In a class of 26 students, 14 have a cat and 7 have a dog. There are 5 students who have a cat and a dog. What is the probability that a student chosen randomly from the class does not have a dog?
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03/25/22

Having a lot of trouble with this. Can someone help?
A fine dining restaurant claims that the group sizes of their customers follows the following distribution: 2 people3 people4 people4+ people 32% 13% 18% 37% Gustavo, a waiter at the restaurant,... more
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