863 Answered Questions for the topic Statistics Question

Statistics Question

01/17/18

mean question of statistics.

the mass of a group of children are 9,11,13,13,15,15,15,a,18,20. given that the median mass is 0.4 greater than the mean mass, find the value of a and state the modal mass.
Statistics Question

01/16/18

please help me !

An anatomy teacher hypothesizes that the final grades in her class are distributed as 10% A's, 23% B's, 45% C's, 14% D's, and 8% F's. If at the end of the semester she has the following grades was... more
Statistics Question

01/08/18

A distribution of values is normal with a mean of 225.5 and a standard deviation of 3.2.

A distribution of values is normal with a mean of 225.5 and a standard deviation of 3.2.Find the probability that a randomly selected value is greater than 222.6. P(X > 222.6) = Enter your... more
Statistics Question

01/08/18

A company produces steel rods. The lengths of the steel rods are normally distributed with a mean of 142.7-cm and a standard deviation of 2.2-cm.

A company produces steel rods. The lengths of the steel rods are normally distributed with a mean of 142.7-cm and a standard deviation of 2.2-cm.Find the probability that the length of a randomly... more
Statistics Question

01/06/18

please help me its a statistic question

It has been reported that 60% of all internet users have been attacked by viruses. If 16 people are randomly surveyed, find the following probabilities: a. At least 6 have been attacked b. No... more
Statistics Question

01/06/18

It has been reported that 25% of all cars on the highway are traveling at speeds in excess of 70 mph. If the speeds of eight random automobiles are measured v

It has been reported that 25% of all cars on the highway are traveling at speeds in excess of 70 mph. If the speeds of eight random automobiles are measured via radar: a. What is the probability... more
Statistics Question

12/31/17

A psychology professor of a large class became curious as to whether the students who turned in tests first scored differently from the overall mean on the test

6. A psychology professor of a large class became curious as to whether the students who turned in tests first scored differently from the overall mean on the test. The overall mean score on the... more
Statistics Question

12/29/17

Standard deviation of lifespan

Within a population of 70 flies, the average lifespan is two months. 60 of the flies live an average of 1.5 months. What is the average standard deviation, in months, of the lifespan of the... more
Statistics Question

12/28/17

confidence level of a statistical test?

If α = 0.10, what is the confidence level of a statistical test? Based on the α level of the question to the left, whatcritical value is used to form the confidence interval?
Statistics Question Statistics Math Help Math Word Problem

12/12/17

Statistics Problem

1) A survey from the Department of Motor Vehicles was given to local residents in the city of Slothville. The results showed that 60% held a valid driver's license. Of the individuals who held a... more
Statistics Question

12/10/17

Normal distribution table

What is the time spent waiting on a kidney transplant, using the standard normal distribution table.  THe mean is 1672 and standard deviation is 209.9.  what waiting time represents the 85%  
Statistics Question

12/05/17

If you had a large collection of data, how might you go about determining whether the distribution was normal?

Question 81 Pge 750 in Math 120.
Statistics Question

12/05/17

Your report should have a conclusion section written in “non-statistical” style that clearly summarizes the major conclusions from the final analysis and discus

Data Code Book  - can send you the data set  
Statistics Question

12/05/17

Statistics question?

A particular group of men have heights with a mean of 171 cm and a standard deviation of 8 cm. Carl had a height of 174cm.?.a. What is the positive difference between Carl's height and the mean? b.... more
Statistics Question Statistics Math Help

12/04/17

For a normally distributed set of data, the percentage of data less than a z-score of 0.83 is

what is the percentage?
Statistics Question Math

12/04/17

In a normally distributed set of data, the mean is 30 and the standard deviation is 5. Find the piece of data that has a z-score of -1.24

 How do I find the data with that z-score?
Statistics Question

12/04/17

Express the original claim in symbolic form. Identify the null and alternative hypotheses

the mean weight of beauty pageants winners is 107 pounds. A study of 18 randomly selected beauty pageants resulted in a mean winner of 108 pounds
Statistics Question Statistics Regression Regression Model

12/02/17

In a regression anaylsis, if r2 = 1, which of the following are implied? a ) SSE = SST b) SSE = 1 c) SSR = SSE d) SSR = SST

A question regarding regression analysis in statistics
Statistics Question Statistics Statistics Method

11/30/17

Type I and II error with small sample size?

Let X ∼ P(λ). We want to test the null hypothesis that λ = 15, and thealternative hypothesis is that λ > 15. Our sample size for this test is equal to 1. (a) We will reject the null hypothesis... more
Statistics Question

11/28/17

A fair die is rolled 12 times. Consider the following three possible outcomes:

(i) 5 2 6 3 2 1 4 1 6 5 3 4(ii) 1 1 2 2 3 3 4 4 5 5 6 6(iii) 6 6 6 6 6 6 6 6 6 6 6 6Which of the following is true? (i) is more likely than (ii) or (iii). (ii) is more likely than (iii). The three... more
Statistics Question

11/27/17

WHAT ARE THE FOUR MAJOR COMPONENT OF STATISTICS?

help me give me the answers of 4 major components of statistics.

11/23/17

I have a question about hypothesis testing with two population mean.

Hi,I have a question about hypothesis testing with two population mean. I have two populations (GPA and expected salary). Also, my research question is: Are the students with high average GPA... more

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