Hate my life right now chapter. 13
Larger percentages in a pie chart take up a _____ portion of the pie
Larger
Cohen's Kappa varies between
0 and 1
Cronbach's Alpha varies between
0 and 1
a researcher records a sample mean equal to 1. 2 if 99. 7% of all scores fall between scores 0. 6 and 1. 8 then using the empirical rule what is the standard deviation for these data
0. 2
Using the Chevyshev theorem we can determine that at least 99% of all scores will fall Within _________ sd of the mean for a distribution with any shape
10
Which of the following data sets is associated with a mean value that is larger than both the median and mode
2, 4, 8, 7, 6, 2 and 0
A researcher computes a sample standard deviation equal to 16. What then must be the value of the sample variance
256
A researcher computes a sample variance equal to 16. What then must be the value of the sample standard deviation.
4
A researcher computes a sample variance equal to 16 what then must be the value of the sample standard deviation
4 (√16=4)
Researcher Accords a large sample of data with a mean equal to 12 and a standard deviation equal to 4. if the data are normally distributed then using the empirical rule which of the following gives the closest estimate for the percent of data that falls between scores of 8 and 16
At least 68%
A researcher records a large sample of data with a mean equal to 36 and a standard deviation equal to 1. 5. if the data are normally distributed then using the empirical rule which of the following gives the closest estimate for the percent of data that falls between scores 33 and 39
At least 95%
Which terms to each of the following measures respectively mean median and mode
Average middle most
a graphical display used to summarize the frequency of discrete and categorical data using bars to represent each frequency is called
Bar chart
Which type of graph is used to summarize group means
Bar graph and line graph
Which measure is used when trying to identify the reliability of a measure
Both cohan's Kappa and cronbach's Alpha
The larger a sector in a pie chart the __________ the percentage of scores in a given category
Larger
Descriptive statistics are procedures used to do all of the following except
Calculate significance
A researcher reports that most people should get about 8 hours of sleep per night. What type of measure was given in this report
Central tendency
A researcher reports that the median annual income of a wage-earner in the United States is about 44,000 what type of measure was given in this report
Central tendency
statistical measures for locating a single score that tends to be near the center of a distribution and is most representative or descriptive of all scores in a distribution is called
Central tendency
A clear presentation of the data is necessary because of all of the following except
Clearly indicate significance for all data
A researcher wants to measure the percent agreement between two Raters, error. Which measure of reliability should the researcher compute.
Cohen's Kappa
A measure of interrater reliability that estimates the level of agreement between two Raters, while taking into account the probability that the two Raters are greedy by chance or error, is called
Cohens Kappa
In a histogram____________ are distributed along the horizontal axis and the _____________ are listed along the vertical axis
Continuous data; frequency of data
Histograms are used to summarize __________ data; bar charts and pie charts are used to summarize __________ data
Continuous; discrete
A scatter plot is specifically used to describe what type of data
Correlated data
a measure of internal consistency that estimates the average correlation for every possible way that a measure can be split in half is called
Cronbach's Alpha
a researcher wants to analyze the reliability of a survey that consists of multiple items used to measure the same construct to determine if all items measure the same construct. Which measure of reliability should the researcher compute
Cronbach's Alpha
which measure of reliability is used to estimate the average correlation for every possible way that a measure can be split in half
Cronbach's Alpha
The mean is an appropriate measure of central tendency for all of the following except
Data skewed
Median is an appropriate measure of central tendency for all of the following except
Data that are on a nominal scale
The mode is an appropriate measure of central tendency for all of the following except
Data that are on an ordinal scale
Procedures used to summarize organize and make sense of a set of scores or observations are called __________ statistics
Descriptive
The use of tables and graphs to summarize data is an example of
Descriptive statistics
The mean is used for data that can be described in terms of the __________ that scores deviate from the mean
Distance
a researcher records the following data for the number of times an interviewer is interrupted during a series of interviews 0,0,3,2,5,3,0,8,0,2,1 and 1. Is the mode equal to the median in this example
Know the median is larger than the mode
What do we do before we summarize data in a figure or table we need to First _________ the data to identify possible emissions errors or other anomalies in a data set
Explorer
The larger the sample variance the __________ that scores deviate from the median on average
Farther
A value that describes the number of times or how often a category score or range of scores occurs is called
Frequency
a graphical display used to summarize a frequency of continuous data that are distributed in numeric intervals using bars connected at the upper limits of each interval is called
Histogram
Cronbach's Alpha is used to measure which type of reliability
Internal consistency
Callahan's Kappa is used to measure which type of reliability
Interrater reliability
The sample mean is approximately used to describe data on which scale of measurement
Interval and ratio
How is the sample standard deviation is computed
It is the square root of the sample variance
the distribution of personal income for u. S. Citizens is skewed if the median annual income is 44000 this implies that the mean annual income is
Larger
In a frequency distribution table lists each score or range of scores in one column and
List scores corresponding frequencies for each score or range of scores in a second column
A researcher records the time (in seconds) that participants arrive late for a scheduled research study assuming these data are normally distributed which measure of central tendency is most appropriate to describe these data
Mean
If a set of data are normally distributed with at least 68% of scores fall in between score 16. 5 and 19. 5. if these values mark this first standard deviation from the mean then what are the values of the mean and standard deviation in this normal distribution.
Mean equals 18. 0, standard deviation equals 1. 5
The middle value in a distribution of data listed in numeric order is called
Median
a researcher Des about participants to rank their top five favorite songs from their childhood based on the scale of measurement describes which measure of central tendency is most appropriate to describe these data
Median
Measures of central tendency
Median, mean, mode
A researcher records the hospital admission rates for coronary heart disease at 10 local hospitals. She finds that two different hospitals have the highest overall rates of Hospital admissions. Which measure of central tendency did this researcher used to describe this data
Mode
In a scatter plot the pattern of a __________ correlation appears as a descending line
Negative
A researcher records the following data for the number of complaints filed (per day) following a controversial policy change a local business 3,8,5,0,4,6,2,1,1,4,2 and 0. Is the mean equal to the median in this example
No the mean is larger than the median
A researcher records the following data for the time (in seconds) it takes 5 relates to cross an electrical grid to obtain reinforcement on the other side: 12,9,13,4 and 12 is the mean equal to the mode in this example.
No the mode is larger than the mean
By convention we use a bar graph when the graphs on the x-axis (horizontal axis) are represented on a __________ scale; we use a line graph when the groups on the x-axis or represented on an __________ scale
Nominal or ordinal; interval or ratio
The sample mean is primarily used to describe data with which type of distribution
Normal
In a scatter plot the pattern of a ________ correlation appears as an ascending
Positive
All of the following are ways in which data can be summarized using descriptive statistics except
Rationally
Which of the following is a common way researchers analyze a data set
Researchers can describe data and make decisions about how to interpret data
The sum of all scores divided by the number of scores summed in a sample is equal to the
Sample mean
a researcher computes variance for two samples of equal size the sum of squares is larger in Sample one compared to sample to in which sample will the variance be larger
Sample one
The formula for the degrees of freedom for sample variance is
Sample size minus 1
A measure of variability for the average distance that scores in a sample deviate from the sample mean is called
Sample standard deviation
a graphical display of discrete data points used to summarize the relationship between two correlated variables is called
Scatter plot
All the following are measures of central tendency except
Significance
A tendency distribution table can summarize the frequency of all of the following except
Significant data
A distribution of scores that includes outliers or scores that fall substantially above or below most other scores in a data set is called
Skewed distribution
The sum of the squared deviations of scores from the mean and the numerator of the sample variance formula is called:
Sum of squares
What value is computed in the numerator of the sample variance formula
Sum of squares
Which of the following words best relates to descriptive statistics
Summarized
The sample mean is
The balance point of a distribution Used to summarize interval and ratio data A measure of central tendency
What is the rule for normally distributed data that states that at least 99. 7% of data fall within 3 SD of the mean; at least 95% of data fall within 2 SD of the mean; and at least 68% of data fall within 1 SD of the mean
The empirical rule
A staff member Accords the number of victories (per-10-gallons) for a new football coach during his first three seasons with a team the coach won 1,3,8 games the following conclusions are appropriate except
The football coach was successful during his first three seasons
Each bar in a bar chart represents
The frequency of a score or category
Each bar in a histogram represents
The frequency of a score or group of scores
A researcher records the following scores on a behavioral assessment 12, 20,9,12,32,18,23,10 and 17. Which of the following is true
The mean is larger than the median
A professor recorded the following grades on a quiz 5, 6,7,7, and 10 which of the following statements is true
The mean median and mode are all the same value
The difference between the largest value in the smallest value in a data set is called
The range
Which of the following statements describes the formula for computing sample variance
The sum of squares divided by the degrees of freedom for sample variance
The name empirical rule comes from the word empiricism meaning
To distribute
All of the following are advantages of exploring or reviewing Data before reporting it except
To fabricate data in cases where data appears to be unaccounted for or missing
The sample mean is all of the following except
Used to summarize normal data
Statistical measures for the dispersion or spread of scores in a distribution or data set is called
Variability
A measure of variability for the square distance that scores in a sample deviate from the sample mean is called
Variance
Which of the following is a measure of variability
Variance and standard deviation
The separation between bars in a bar chart reflects the separation or break between the ___________ being summerized
Whole numbers, discrete data, and categories
On which axis do we list the names of groups in a bar or line graph
X axis
On which axis do we list the values of the dependent variable in a bar or line graph
Y axis
A Researcher records the following data for the number of different food items chosen by 7 participants in a buffet style setting 1,6,2,5,4,3 and 7. Is the mean equal to the median in this example
Yes
A researcher recorded the following data for the number of Dreams recalled during a night of sleep for 10 college students 3, 2, 4,4,3,1,1,0,2,0. Is the mean equal to the median in the sample
Yes