866 Answered Questions for the topic Statistics Question
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
Statistics Question Statistics
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
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)
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
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
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
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
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
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
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.)
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
. 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
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
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
.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
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
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
ONe card is randomly selected from a stadard 52 card deck. Which of the following gives the probability that the card is a black ace?
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?