843 Answered Questions for the topic Statistics Question

Statistics Confidence Interval

In a randomized comparative experiment on the effect of dietary calcium on blood pressure, researchers divided 48 healthy white males at random into two groups. One group received calcium; the... more

Statistics Confidence Interval

Europeans have been more skeptical than Americans about the use of genetic engineering to improve foods. A sample survey gathered responses from random samples of 862 Americans and 12083 Europeans.... more

On an exam whose scores followed a normal distribution, a student's z-score was −1.

What percentage of students scored better than he did? (Use the 68-95-99.7 Rule.)

Between z >1.36 and z <1.99

 need help 

An engineer is going to redesign an ejection seat for an airplane. The seat was designed for pilots weighing between 150 lb and 201 lb.

An engineer is going to redesign an ejection seat for an airplane. The seat was designed for pilots weighing between 150 lb and 201 lb. The new population of pilots has normally distributed weights... more

which of the following would be the mean of this data set 5,17,22,56,4,2,33,21

A. 16.90 B. 20.00 C. 18.06 D. 19.00

What is the percentage of the men between the following values?

Heights of men on a baseball team have a bell-shaped distribution with a mean of 175 cm and a standard deviation of 8 cm. Using the empirical rule, what is the approximate percentage of the men... more

calculating probalities using a confidence interval of sample size

For a random sample sample of 150 households in a large metropolitan area, the number of households in which at least one adult is currently unemployed and seeking a full time job is 12. Using a... more

what is the expected number of correct answers Jason will get on the 12-question quiz?

If he randomly selects responses between the 3 remaining choices for each question, what is the expected number of correct answers Jason will get on the 12-question quiz?

20 cars , 7 have defects If I pull 2 randomly what probability 2 have defects?

20 cars, 7 have defects If I pull 2 randomly what probability 2 have defects?

what is the probability of spinning all the colors of a 4 color spinner in 5 turns

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Statistics question

Suppose we are with a real estate agency that hasthe following houses listed in a specific geographicarea. $150,000; $146,000; $152,000; $155,000;$143,000; $157,000; $180,000; $148,000;... more

Normally distributed

Eleanor scores 680 on the mathematics part of the SAT. The distribution of SAT math scores in recent years has been Normal with mean 555 and standard deviation 79.Gerald takes the ACT Assessment... more

Is this question is a combination or a permutations? and how to solve it step by step ?

How many licence plates of three symbols (letters and digits) can be made using at least one letter in each? 

What is the z score of x=9, if 9 is 1.5 standard deviations to the left of the mean?

I would like some help with this question and explanation.  

usual and unusual values

A certain group of test subjects had pulse rates with a mean of 80.580.5 beats per minute and a standard deviation of 10.510.5 beats per minute. Would it be unusual for one of the test subjects to... more

Normal Distribution

How do I tell if my data is normally distributed looking at my data on the Shapiro-Wilk output?   Male: Statistic: .966 df: 14 Sig. .822   Female: Statistic: .912 df: 14 Sig:... more

independent t test

Which of the following is always true regarding the relationship between the one- and two-tailed significance tests? Select all that are true.Question 10 options:If the two-tailed test is... more

independent sample t test

A 95% confidence interval for the difference of means is calculated to be -1.23 to -0.33. What conclusion can be made? Select all that are true.Question 9 options:The two group means are equal.The... more

The combined standard deviation of the groups’ data, as if it were not separated into to different groups is called the

The combined standard deviation of the groups’ data, as if it were not separated into to different groups is called the: standard errorpooled standard deviationaverage errorpooled standard error

discount depend of product quantity

let's say we make business, we sell products, but if anyone buys more we will discount more, let's say if we sell 5000 product 2$ for each, and we sell 1000000 by 0.35$ for each, can anyone give me... more
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