951 Answered Questions for the topic Statistics Question

Statistics Question Statistics Statistic

06/28/21

Normal Distribution
The town of KnowWearSpatial, U.S.A. operates a rubbish waste disposal facility that is overloaded if its 4699 households discard waste with weights having a mean that exceeds 26.7 lb/wk. For many... more
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Statistics Question Statistics

06/08/21

P(A) = 0.5, P(B) = 0.5, and P(AandB) = 0.05. P(not B ∣ A)= ?
I've attempted this by doing A-B and dividing that answer by A as told, and got it wrong. I did this with a venn diagram and went by a video supplied below the question, and still come up wrong. I... more
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Statistics Question Statistics Economics Econometrics

06/06/21

How do you calculate the confidence intervals for a population mean with only the sample mean and sample standard deviation?
I have a random sample and need to calculate the 95% confidence interval for the population mean(sample mean = 1076sample standard deviation = 80.61sample size is n=5)
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Statistics Question Math Statistics

05/23/21

Uniform, Geometric, binomial or Normal?
The time of day when an earthquake occurs. (Uniform, Geometric, binomial or Normal?)The number of people I have to ask until someone lets me borrow their cell phone to make a phone call. (Uniform,... more
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Statistics Question Math Statistics Standard Deviation

01/19/21

standard deviation question
What happens to the curve when the standard deviation is increased? What does that do to the area under the curve? What happens to the curve when the standard deviation is decreased? What does... more
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Statistics Question Math Help Math Question Stats

04/29/20

Regression Help
The following table gives information on the amount of sugar (in grams) and the calorie count inone serving of a sample of 13 varieties of Kellogg’s cereal. Sugar... more
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Statistics Question Math Mathematics Stats

04/21/20

Two Population Means
At a recent faculty meeting, we were wondering if freshmen have more free time than seniors. We took a sample of 25 freshmen and 23 seniors. Each student was asked to record the amount of free time... more
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Statistics Question Math Statistics Sat Math

03/02/20

Statistics question- Testing a Hypothesis (Type I and Type II errors)
Remember our bank that’s sending out DVDs to try to get customers to make payments on delinquent loans? It is looking for evidence that the costlier DVD strategy produces a higher success rate than... more
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Statistics Question Stats Two Sample T

12/04/19

Statistics Two-Sample t Statistic
Is there a difference in the amount of airborne bacteria between carpeted and uncarpeted rooms? In an experiment, seven rooms were carpeted and seven were left uncarpeted. The rooms are similar in... more
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Statistics Question Statistics Stats Confidence Interval

11/26/19

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
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Statistics Question Statistics Confidence Interval

11/24/19

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
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Statistics Question

10/08/18

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.)
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Statistics Question Saticitics

10/08/18

Between z >1.36 and z <1.99
 need help 
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Statistics Question

10/07/18

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
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Statistics Question Statistics Stats

10/03/18

. What is the total predicted population of this country in​ 2050?
It was predicted that a country will have an elderly population (65 and older) of 8 comma 862 comma 0008,862,000 in the year 2050 and that this will be 20.520.5% of the population. What is the... more
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Statistics Question

09/29/18

Statistical poll question
I interviewed 100 people. I asked them to look at a photograph of 2 men. One is 17 years old and the other is 20 years old. The people interviewed had to guess who was the older looking man in the... more
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Statistics Question

09/29/18

what proportion of rods has a length less than 29.9 cm?
steel rods are manufactures with a mean length of 30 cm. because of variability in the manufacturing process, the lengths of the rods are approximately normally distributed with a standard... more
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Statistics Question

09/26/18

.The pH measurement for a stream was 4.83. mean= 4.20, standard deviation=0.1023. PH for all streams have a bell shaped distribution
The pH measurement for a stream was 4.83. The mean pH for the watershed was 4.20 with standard deviation of 0.1023. Assume the pH for all streams that are part of the watershed have a bell-shaped... more
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Statistics Question

09/25/18

A pie chart shows the relative market share of cola products. The slaves for Pepsi-Cola has a central angle of 90°. What is its market share
Just a queation
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Statistics Question

09/23/18

Use the standard normal distribution or the​ t-distribution to construct a 90​% confidence interval
Use the standard normal distribution or the t-distribution to construct a 90% confidence interval for the population mean. Justify your decision. If neither distribution can be used, explain why.... more
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Statistics Question

09/23/18

Find the mean of this variable.
Consider the following table.Weekly hours worked                                     Probability1-30 (average=22)                                          0.0831-40 (average=35)                    ... more
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Statistics Question

09/23/18

If you created the probability distribution for these data, what would be the probability of 18-29?
Consider the following table.Age Group          Frequency18-29                   983130-39                   784540-49                   686950-59                   632360-69                  ... more
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Statistics Question

09/23/18

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
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Statistics Question Statistics

09/16/18

The tallest living man at one time had a height of 249 cm. Height of men at that time had a mean of 173.71 and a standard deviation of 6.76 cm.
Which of these two man had a height that was most extreme. Use Z scores to compare the hidde value.
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Statistics Question

09/10/18

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
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