1578 Questions for the topic 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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10/08/18

Between z >1.36 and z <1.99
 need help 
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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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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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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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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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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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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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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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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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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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09/23/18

Let x represent the number of pets in pet stores. This would be considered what type of variable: Lagging Continuous Discrete Nonsensical
Let x represent the number of pets in pet stores. This would be considered what type of variable: A.LaggingB.ContinuousC.DiscreteD.Nonsensical
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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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09/20/18

how many possible combinations?
I have three pairs of shoes. I plan to wear them over the next ten days as follows: I dont want to wear the same pair on two consecutive days, and I dont want to wear the same pair on the first day... more
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09/20/18

how do i solve
Forty-two percent of all registered voters in a particular state prefer life in prison without parole over the death penalty for a person convicted of first degree murder. Among Latino registered... more
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09/19/18

Question won't fit so it's in summary
Let the Universal Set, S, have 158 elements. A and B are subsets of S. Set A contains 13 elements and Set B contains 100 elements. If the total number of elements in either A or B is 112, how many... more
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09/19/18

Find the probbability that among the first 5 songs played (a) you like 2 of them?
Suppose a compact disk (CD) you just purchased has 16 tracks. After listening to the CD, you decide that you like 6 of the songs. The random feature on your CD player will play each of the 16 songs... more
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09/18/18

Statistics Question about the subway
Every day your friend commutes to school on the subway at 9 AM. If the subway ison time, she will stop for a $3 coffee on the way to class. If the subway is delayedshe skips the coffee and goes... more
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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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09/13/18

Complete Statistics Question Listed In Description
• The average weight of an adult male is 170 lbs.with a standard deviation of 30 lbs. Nine (9) adult men entered an industrial elevator located in the in the loading area of a manufacturing... more
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09/11/18

A certain group of test subjects had pulse rates with a mean of 77.3 beats per minute and ....
A certain group of test subjects had pulse rates with a mean of 77.3 beats per minute and a standard deviation of 12.2 beats per minute. Use the range rule of thumb to identify the limits... more
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09/11/18

For any data set we can say ______ _______ ________ % of values fall within 2 standard deviations of the mean.
I know it is not 95 since the system marks as incorrect answer
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09/10/18

Find upper P 75
Below are 36 sorted ages of an acting award winner. Find Upper P 75. 18 19 24 24 26 30 32 34 34 34 36 37 37 39 41 42 42 44 47 54 57 60 61 62 62 65 67 69 69 70 72 72 72 74 76... more
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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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09/10/18

What are the z scores that separate the unusual IQ scores from those that are​ usual?
IQ scores are measured with a test designed so that the mean is 107 and the standard deviation is 19. Consider the group of IQ scores that are unusual. What are the z scores that separate the... more
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