Question

For the distribution of scores on a certain statistics test is strongly skewed to the left, which of the statement is NOT correct?

A. There are approximately 68% of the data points fall into the range of +1 SD and -1 SD in this distribution

B. Mean < Median

C. Median and interquartile range are a set of measures more appropriate to describe the center and spread for the distribution.

D. All of them above

Answer #1

Solution :

We know that only for symmetric distributin 68% data lies in 1SD
of mean hence it is not correct for Negatively skewed distribution.
**Hence Option A is NOT Correct.**

for negatively skewed distribution Mean < Median < mode

**Hence option B. Mean < Median is correct**

Also for skewed distribution median is good estimator for centre
point than mean. **Hence option C is correct.**

Hence Answer :

**A. There are
approximately 68% of the data points fall into the range of +1 SD
and -1 SD in this distribution**

The distribution of scores on the test written by a group of
students is skewed with the mean of 80 points and standard
deviation of 5 points.
According to Tchebysheff’s Theorem, at least 75 % of scores will
fall into the interval between _____ points and ______ points.
At least______% of the scores fall between 65 and 95 hours.
At most_____ % of the scores are smaller than 65 points.
At most_____% of the scores are smaller than 65 points...

1)
The interquartile range (IQR) is a measure of the ____________
of the middle ____________ percent of the data.
Choose the answers below that correctly fills in the blanks.
The interquartile range (IQR) is a measure of the▼center/spread
of the middle▼50 /25 /75 percent of the data.
2) How can you tell from a boxplot if the distribution is
skewed right?
Choose the correct answer below.
A. The median is to the left of the center of the box, and...

1. On a certain test grades are skewed to the left with a mean
of 75 and a standard deviation of 5. A statistics teacher takes a
sample of 64 test grades.
(A) What is the probability the mean of the 64 test grades was at
least 74? (9 points)
(B) What mean separates the highest 10% of means from the rest of
the means? (10 points)
Show work and excel formulas

A business statistics professor gives 100-point exams to two
different sections of business statistics. The scores in one
section, Section 001, of the class were 40, 50, 61, 63, 67, 74, 74,
76, 76, 78, 78, 80, 82, 86, 87, 87, 87, 88, 90, 90, 91, 92, 92, 93.
The other class, Section 002, had scores of 67, 67, 68, 75, 75, 76,
79, 79, 80, 80, 80, 83, 86, 87, 87, 88, 89, 89, 90, 90, 90,
91.
Based...

Scores on the test in a statistics class are as follows. 55 26
75 52 80 85 80 99 90 60 86 92 40 74 72 55 87 70 85 100
a. Calculate the 25th, 50th, and 75th percentiles. Use Excel
quartile.exc func tion. Round your answers to 2 decimal places.
b-1. Calculate the interquartile range. Show work. Round your
final answers to 2 decimal places.
b-2. Are there any outliers? Show work. Justify your selection.
Yes
No
c. Is...

what type of distribution is described by the following
information?
Mean= 8.5 Median=9.0 Mode=10
A. (Left) negatively skewed
B. Symmetrical (Normal)
C. Bimodal
D. (Right) positively skewed
The mean IQ score of adults is 100, with a standard deviation
of 15. Use the empirical rule to find the percentage of adults with
scores between 70 and 130. ( Assume the data set has a bell shaped
distribution.).
A. 99.7%
B. 100%
c. 95%
D. 68%
The distances (in miles) driven...

Below are summary statistics for the distributions of the
variable pupil/teacher ratio with respect to whether the school has
high or low completion rate.
pupil/teacher ratio->
Mean
Median
SD
IQR
Count
High Completion rate (>80%)
14.85
14.40
4.39
4.2
35
Low Completion Rate (<80%)
16.32
16.60
3.92
6.3
15
In the space provided below, answer the following questions.
a) On average, the completion rate is larger with the high or
low pupil/teacher ratio? Explain. Use the appropriate numerical
values to...

For items 1-5 (2 pts each), use the following scores to
calculate the descriptive statistics below: 2, 4, 6, 8, 8, 8
1. Mean =
4. Standard deviation =
2. Mode =
5. Degrees of Freedom
=
3. Median =
For items 6-7, use the data from a standardized test (m = 75, s
= 10) that measures superhuman power. In addition to calculations,
be sure to complete the distribution below by labeling...

Countdown: Days:-11 Time:-07:50:40 checkpoint #2: Examining
Distributions cont'd Schedule: Available now. Due 02/04/2020 11:59
PM EST Page 1 Question 1 Select one answer. 10 points The
distribution of the IQ (Intelligence Quotient) is approximately
normal in shape with a mean of 100 and a standard deviation of 15.
According to the standard deviation rule, only 0.15% of people have
an IQ over what score? 55 100 115 130 145 Question 2 Select one
answer. 10 points The distribution of the...

1. Which of the following statements is correct?
a. The median can be strongly influenced by just one or two
very low or high values.
b. The mode gives equal consideration to even very extreme
values in the data.
c. There will be just one value for the mean, median , and mode
in the data set.
d. The mean is able to make the most complete use of the data
when compared to the median and mode.
e. None...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 10 minutes ago

asked 17 minutes ago

asked 20 minutes ago

asked 22 minutes ago

asked 29 minutes ago

asked 36 minutes ago

asked 43 minutes ago

asked 51 minutes ago

asked 51 minutes ago

asked 51 minutes ago

asked 1 hour ago

asked 1 hour ago