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Descriptive Statistics
Page 8
Questions (1,516)
On his midterm exam, Jimmy scored 75
points, which was exactly 2 standard deviations above the mean. If the standard deviation
4 answers
asked by
Diandra
823 views
A sample has a mean of M 40 If a score of X 55 is removed from the sample then the sample mean will increase
2 answers
asked by
thcker
592 views
A specific study found that the average number of doctor visits per year for people over 55 is 8 with a standard deviation of 2.
3 answers
asked by
Cameron
1,082 views
2005 2006 2007 2008
Plant 1 20 4 25 10 Plant 2 25 5 5 48 Plant 3 20 8 20 32 Plant 4 43 10 10 47 Plant 5 40 11 15 48 A gardener
3 answers
asked by
shane
676 views
Weights of male mountain lions follow the normal distribution with a median of 150 lb and an interquartile range of 8.2 lb.
Fin
4 answers
asked by
Andrea
582 views
a. Compute the mean, median, and mode.
b. Compute the variance, standard deviation, range, coefficient of variation, and Z
3 answers
asked by
lou
1,343 views
What is the z-score for a test score of 440 in which the test has a normal distribution of N(400, 50)?
4 answers
asked by
Angie
460 views
Suppose the mean height of a population is 65 inches with a standard deviation of 1.5 inches. What is the z value for a height
3 answers
asked by
jassi
380 views
A survey of college students was conducted during final exam week to assess the number of cups of coffee consumed each day. The
3 answers
asked by
Scott
1,425 views
A gallup poll of 1236 adults showed that 14% believe that bad luck follows if your path is crossed by a black cat, so n=1236 and
3 answers
asked by
marie
825 views
in a distribution of 160 values with a mean of 72,at least 120 fall within the interval 67-77. approximately what percentage of
4 answers
asked by
ellen
1,332 views
Henry's z-score on his reading test was 1.27. The class average was 60, the median was 58.5 and the variance was 6.2. What was
3 answers
asked by
Nicholas
545 views
Suppose the mean height of a population is 65 inches with a standard deviation of 1.5 inches. What is the z value for a height
3 answers
asked by
Erik
652 views
sample was obtained from a population with unknown parameters. scores: 6, 12, 0, 3, 4
compute the sample mean and sandard
3 answers
asked by
T
1,150 views
In a particular hospital, 6 newborn babies were delivered yesterday. Here are their weights (in ounces):
112, 96, 109, 126, 99,
2 answers
asked by
Rachal
651 views
The heights of the students in a statistics class are approximately normal with mean 68 inches and a standard deviation of 2.75
2 answers
asked by
Alex
904 views
the mean of adult men is 172 pounds with a standard deviation of 29 pounds. ask 20 men thier weight and use excel to calculate
3 answers
asked by
natasha
566 views
Find the range, standard deviation, and variance for the following sample data:
98, 2, 53, 61, 15, 87, 63, 63, 91, 29, 96, 79,
4 answers
asked by
mary, can't figure out calculation, please show your calculations for all questions listed above a-e
1,291 views
It has been reported that 83% of federal government employees use email. If a sample of 200 federal government employees is
3 answers
asked by
Anonymous
2,047 views
the amount of time spent in North American adults watching television per day is normal distributed with a mean of 6 hours and a
4 answers
asked by
Marcus
478 views
For a normally distributed distribution of variable x, where the mean is 50, and standard deviation is 2.5, calculate: a) the
4 answers
asked by
Ally
1,118 views
i am trying to find this answer there are 3 questions.
1. micheal kept the following records of her phone bills for 12 months:
3 answers
asked by
george
543 views
A professor has noticed that, even though attendance is not a component of the final grade for the class, students that attend
4 answers
asked by
Carrie
1,102 views
The weights (in pounds) of a sample of five boxes being sent by UPS are: 12, 6, 7, 3, and 10.
a. Compute the range. b. Compute
4 answers
asked by
Dan
1,410 views
The standard deviation of a data set is 4. What is the variance?
(1 point) Responses 2 2 4 4 8 8 16
11 answers
asked anonymously
85 views
a sample of n=25 scores has a mean of M=60 and a std dev of s=12. Find the z-score corresponding to each of the following scores
2 answers
asked by
annabelle
819 views
For a sample with a mean of M=85, a score of X=90 corresponds to a z-score of z=1.00. What is the sample standard deviation?
3 answers
asked by
Andrew
887 views
Construct a frequency distribution of the ages that 25 randomly selected smokers started smoking:
26 26 25 17 16 16 14 17 21 16
3 answers
asked by
Rose
419 views
Select all that apply
Which of the following represents the expected value? Multiple select question. σ2 μ Var(X) σ SD(X) E(X)
2 answers
asked anonymously
48 views
A variable has a mean of 1,520 and a standard deviation of 80.
a. Using Chebyshev's theorem, what percentage of the observations
2 answers
asked anonymously
90 views
The monthly telephone usage (in minutes) of 30 adults is listed below. Find the interquartile range for the telephone usage
7 answers
asked by
AOL
54 views
(a) Compute the z-score corresponding to the individual who obtained 35.2 miles per gallon. Interpret this result.
The
7 answers
asked by
AOL
50 views
Given the following observations from a sample, calculate the mean, the median, and the mode. (Round "mean" to 2 decimal
2 answers
asked anonymously
35 views
Consider the following sample data:
x 25 18 20 12 22 y 27 20 25 15 22 picture Click here for the Excel Data File a. Calculate the
2 answers
asked anonymously
75 views
Consider a sample with 10 observations of −3, 0, 5, 10, 12, −3, −2, 0, −3, and 8. Use z-scores to determine if there are
2 answers
asked anonymously
64 views
Data with 150 observations are drawn from a bell-shaped distribution with a mean of 30 and a standard deviation of 7.
2 answers
asked anonymously
68 views
To determine what effect the salespeople had on purchases, a department store polled 700 shoppers as to whether or not they had
4 answers
asked by
Kimberly
3,177 views
Suppose babies born after a gestation period of 32 to 35 weeks have a mean weight of 2900
grams and a standard deviation of 700
1 answer
asked by
AOL
53 views
The ---represents the number of standard deviations an observation is from the mean.
a. quartile b. z dash score c. percentile d.
2 answers
asked by
AOL
32 views
A sample of 11 observations taken from a normally distributed population produced the following data.
−7.1 10.3 8.7 −3.6
4 answers
asked by
----
1,731 views
The following data represent the amount of time (in minutes) a random sample of eight students took to complete the online
2 answers
asked by
AOL
50 views
Find the population mean or sample mean as indicated.
Sample: 21,18,4,7,10 Select the correct choice below and fill in the
2 answers
asked by
AOL
38 views
what are the mean and standard deviation of a sampling distribution consisting of samples of size 16? these sameples were drawn
3 answers
asked by
helga
2,333 views
Select all that apply
Which of the following are included in a five-number summary? Multiple select question. Q2 The minimum
2 answers
asked anonymously
53 views
The test marks for 29 students studying STSA 1624 produced a mean of 72,8% and a variance of 275,56%. If the distribution of the
2 answers
asked anonymously
48 views
This assignment will assess your ability to calculate the mean, median,
mode, variance, and standard deviation of a set of data.
7 answers
asked anonymously
58 views
What are the means of the two datasets listed? (Round your answers to the nearest thousandth if necessary.)
Dataset 1:
4 answers
asked by
Muntasir Zarif
73 views
central tendency theoren
2 answers
asked anonymously
35 views
What are outliers?
2 answers
asked anonymously
31 views
Describe the change to the MEAN if 1 is added to the data set below:
4, 12, 7, 0, 5, 2
4 answers
asked by
unkown
45 views
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