QuestionQuestion

Twenty Long-Evans rats have been trained on a brightness discrimination task. Their scores (errors) are as follows:
6 8 9 6
6 5 4 12
9 8 4 5
6 6 7 8
6 7 11 7

Arrange the data into a frequency distribution, and use the distribution to solve the following problems.

The cumulative percentage of rats making 6 or fewer errors is
80%.
50%.
65%.
90%.

The real limits of the score of 20 are
19–21.
19.5–20.5.
19.75–20.25.
20–20.

The scores on an exam in history of psychology are shown in the following frequency distribution. Use the distribution to solve the following problems.

X f    X f    X f    X f
95 2    66 1    49 1    30 1
85 1    64 1    42 1    28 1
83 1    63 1    41 2    26 1
81 1    56 1    40 2    23 1
78 1    52 1    34 1    22 1
72 2    51 1    31 1

What percentage of students scored below 72?
70.37%
77.78%
25.93%
59.26%

How many students scored 85 or below?
24
21
25
26

Solution PreviewSolution Preview

This material may consist of step-by-step explanations on how to solve a problem or examples of proper writing, including the use of citations, references, bibliographies, and formatting. This material is made available for the sole purpose of studying and learning - misuse is strictly forbidden.

IQ          Frequency
4 – 5           4
6 – 7           9
8 – 9           5
10 – 11          1
12 – 13          1

1) 10/20=50%

To find the answer you count the number of Long-Evans rats that scored 6 or less mistakes {6,6,6,5,4,4,5,6,6,6} and divide by the total number of rats – this was given in the question prompt (20)....
$15.00 for this solution

PayPal, G Pay, ApplePay, Amazon Pay, and all major credit cards accepted.

Find A Tutor

View available General Statistics Tutors

Get College Homework Help.

Are you sure you don't want to upload any files?

Fast tutor response requires as much info as possible.

Decision:
Upload a file
Continue without uploading

SUBMIT YOUR HOMEWORK
We couldn't find that subject.
Please select the best match from the list below.

We'll send you an email right away. If it's not in your inbox, check your spam folder.

  • 1
  • 2
  • 3
Live Chats