Psychology CC 5 Week 2 Worksheet 3 Exam Quiz

Psychology CC 5 Week 2 Worksheet 3 Exam  Quiz | chatbot las positas  community college

Question 1

Variability refers to _____________________.    

·         the spread of the sample scores.  

·         the number of scores in a sample.  

·         the precision of the sample mean. 

·         Joe Mama.

 

Question 2

Which of the following is a measure of variability?  

·         The standard deviation 

·         The mode 

·         The median 

·         Correlation Coefficient

 

Question 3

The difference between the highest and the lowest values in a distribution of scores

is known as the __________________.    

·         range.  

·         median. 

·         midpoint. 

·         deviation.

 

Question 4

Standard deviation can only be used for variables measured at which level? 

·         The interval level 

·         The nominal level 

·         The ordinal level 

·         Qualitative level 

·         Joe Mama

 

 Question 5

Which of the following is the least accurate measure of variability?  

·         The range 

·         The standard deviation 

·         The variance 

·         The mean

 

Question 6

What is true about box plots?  

·         They display a variety of aspects of a distribution.  

·         They best display standard deviation.  

·         They best display similar ranges.  

·         They best display mean and mode.

 

Question 7

Which of the following is true of probabilities?  

·         A probability varies from 0 to 1.0.  

·         A 0 probability implies something is possible.  

·         A 1.0 probability implies something is impossible.  

·         I couldn't think of a fourth option. So...Joe Mama.

 

Question 8

Empirical probabilities are __________________________  

·         essentially percentages based on a large number of observations.  

·         scores from a sample. 

·         deeply rooted in probability.  

·         based on the normal curve.

 

Question 9

Which of the following is true of the normal distribution?  

·         All of the other answers are true.  

·         The normal distribution is symmetrical.  

·         The normal distribution is unimodal.  

·         The tails extend indefinitely in either direction.

 

 

Question 10

Roughly __________ % of the total area under the normal curve rests between two standard deviations above and below the mean.  

·         95 

·         99  

·         47  

·         68  

·         88  

·         666 

·         420

 

Question 11

Research that analyzes a portion of an entire population is carried out on a __________  

·         sample.  

·         population.  

·         census.  

·         survey.  

·         stretcher, bro.

 

Question 12

The difference between the sample mean and the population mean is called _______________  

·         sampling error. 

·         population variance.  

·         sample variance. 

·         mean variance.

 

Question 13

Which variety of nonrandom sampling takes proportions into consideration?  

·         Quota 

·         Purposive 

·         Judgment 

·         Convenience

 

Question 14

What difference between the sample and population results regardless of how well the sampling plan has been designed? 

·         Sampling error  

·         Measurement mishap  

·         Human error  

·         Sigma erroneous  

·         Joseph Madre

 

Question 15

A frequency distribution of a large number of random sample means that have been drawn from the same population is called the _____________________  

·         sampling distribution of means.  

·         standard error of the means. 

·         sampling error.  

·         standard error of measurement.

 

Question 16

The standard error of the mean is _____________________________  

·         the standard deviation of a theoretical sampling distribution.  

·         equal to the sample size minus 1.  

·         the same as the population standard deviation. 

·         the same as the sample standard deviation.

 

Question 17

In systematic sampling, ___________________________________________  

·         every nth member of the population is taken from a list and included in the sample.  

·         every member in the population is included in the sample.  

·         a probability sample is taken using a table of random numbers.  

·         members are chosen by homogeneous subgroups or strata.

 

 

Question 18

When increasing the level of confidence from 95% to 99%, we __________________  

·         lose precision but gain confidence that our answer interval is accurate. 

·         lose precision and lose confidence that our answer interval is accurate. 

·         lose confidence but gain precision.  

·         find it's less likely any individual sample mean comes from a given population.

 

 

Question 19

The t distribution more closely approximates the distribution of the normal curve when the ____________.  

·         degrees of freedom increase.  

·         degrees of freedom decrease.  

·         sample size decreases.  

·         mean of the sample grows further from the mean of the population.

 

 

Question 20

How do we find the standard deviation?   

·         Get the square root of s-squared. 

·         Square the mean. 

·         Get the sum of squares.  

·         Square s-squared.

 

 

Question 21

Here is a distribution of quiz scores for a statistics course: 87, 91, 74, 73, 80, 84, 68, 75

What is the range?

 

 

Question 22

SAME DATA FROM PREVIOUS QUESTION: Here is a distribution of quiz scores for a statistics course: 87, 91, 74, 73, 80, 84, 68, 75

What is the variance? *whole number

 

 

Question 23

SAME DATA FROM PREVIOUS QUESTION: Here is a distribution of quiz scores for a statistics course: 87, 91, 74, 73, 80, 84, 68, 75

What is the standard deviation? *round to hundredths

 

Question 24

On a standardized test of mathematical ability, Kim scored a 40 and John scored a 20.60. The distribution of test scores for the population is normal, with a mean of 33 and a standard deviation of 6.3.

 Kim is at the ____________ percentile. *round to nearest whole number

 

 

Question 25

SAME DATA FROM PREVIOUS QUESTION: On a standardized test of mathematical ability, Kim scored a 40 and John scored a 20.60. The distribution of test scores for the population is normal, with a mean of 33 and a standard deviation of 6.3.

The percentage of the population that scored below John is __________%. *round to hundredths place

 

 

Question 26

SAME DATA FROM PREVIOUS QUESTION: On a standardized test of mathematical ability, Kim scored a 40 and John scored a 20.60. The distribution of test scores for the population is normal, with a mean of 33 and a standard deviation of 6.3.

 The percentage of the population that scored between Kim and John is _____________%

*round to the hundredths place

 

 

Question 27

What are the odds of rolling a 12 on two six-sided dice?

__________%

(In percentage, not proportion, hundredths place)

 

Question 28

An education researcher is interested in studying student performance on the new SAT. The researcher takes a random sample of 200 students and calculates a sample mean of 1600. The standard deviation of the population is 90.

What is the standard error of the mean? *round to hundredths place

 

Question 29

SAME DATA FROM PREVIOUS QUESTION: An education researcher is interested in studying student performance on the new SAT. The researcher takes a random sample of 200 students and calculates a sample mean of 1600. The standard deviation of the population is 90.

The 95% confidence interval is  _____________ to 1612.47. *answer is rounded to the hundredths  

 

Question 30

SAME DATA FROM PREVIOUS QUESTION: An education researcher is interested in studying student performance on the new SAT. The researcher takes a random sample of 200 students and calculates a sample mean of 1600. The standard deviation of the population is 90.

The 99% confidence interval is  1583.59 to _________.  *answer is rounded to the hundredths