20 Answered Questions for the topic Z Score

06/29/21

statistics help
The average amount of time it takes for couples to further communicate with each other after their first date has ended is 2.45 days. Is this average different for blind dates? A researcher... more
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02/12/21

Statistics question HELP
Every year "Nathan's hotdog stand of Coney Island NY holds a hot dog eating contest. Assume the that number of hot dogs eaten by contestants last year was normally distributed with a mean of 40 and... more
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05/12/20

what is the z score?
the number of hits a particular website receives in a day is normally distributed with a mean of 6250 hits and a standard deviation of 480 hits. what is the Z score for a day in which the website... more
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02/25/20

Better Relative Position when both Z Scores are negative

Which Z-Score has the better relative position? -2.05 or -3.33
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04/11/18

How many of the members will weigh 165 pounds or more?
The weights of members of a baseball league are normally distributed with a mean of 176 pounds and a standard deviation of 11.4 pounds. Consider a league membership of 120 members.
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04/11/18

What is the age of a movie attendee with a z-score of −1.2 ?
The ages of people in a movie theater are normally distributed with a mean of 32 years and a standard deviation of 6.2 years. (round to nearest tenth)
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04/02/18

There is a 88.4% chance that my value of x is 30 or greater. If I assume my data is normally distributed..
There is a 88.4% chance that my value of x is 30 or greater. If I assume my data is normally distributed, can I determine the likelihood that my value of x is 26, 27, 28, 29, 31, 32, 33, 34... more
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Z Score

12/05/17

Percentage of data between the mean
for a normally distributed set of data find the area of the normal curve for the region between z scores of 0.74 and 1.62
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Z Score

12/05/17

Data less than a z score of 0.83 is
for a normally distributed set of data the percentage of data less than a z score of 0.83 is
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Z Score

12/05/17

Z score and area under normal curve
for a normally distributed set of data find the area of the normal curve for the region between z scores of 0.74 and 1.62
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Z Score

10/31/17

Find the​ z-scores that separate the middle 31​% of the distribution from the area in the tails of the standard normal distribution.
find the z scores that separate the middle 31% of the distribution 
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Z Score

10/31/17

Find the z scores that separate the middle 80% of the distribution from the area in the tails of the standard normal distribution
Find the z score that separates 80% of the distribution 
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05/25/17

What would the mean be?
Person A has a z-score of -3 and is on her phone for 7 hours a day. Person B has a z-score of -4 and is on her phone for 3 hours a day. It is a normal distribution. What would be the mean of the... more
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05/20/16

Scores on a certain IQ test are approximately normally distributed with a mean of 110 and a standard deviation of 25. In what range do the middle 95% of all sco
PLEASE HELP!!!!
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04/20/16

help with a problem and is there any way to check my answer so i am not double guessing?
An elevator has a stated maximum capacity of 12 people or 2004 pounds. If 12 people have weights with a mean greater than (2004/12) = 167 pounds, the capacity will be exceeded. Assume that weights... more
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Z Score

02/21/16

Using a normal curve table, what percentage of students have a z scores (a) below 1.5 (b) above 1.5 (c) below -1.5 ?
A psychologist has been studying eye fatigue using a particular measure, which she administers to students after they have worked for 1hour writing on a computer. On this measure, she has found... more
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11/05/15

Z-score Stats question
I have no idea evn how to start this question  The average Demand for renatl skis on winter Saturdays at a particular area is 150 pairs which has been quites stable over time. There is variation... more
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08/12/15

College Statistics problem help
A weight loss center provided a loss for 72% of its participants.  The center’s leader decides to test a new weight loss strategy on a random sample size of 140 and found weight loss in 78% of the... more
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Z Score

07/22/15

If the raw score is 62, the mean is 58 with a standard deviation of 8, what is the Z score?
 An individual receives a raw score of 62 on a national standardized test. Given that the mean & standardized deviation of the test were 58 and 8, respectively, what is the individual's Z-score?
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Z Score

12/10/14

Using the z table calculate the following percentage for z score of -0.08?
Above the z score   Below the z score   At least as extreme as this z score
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