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Elementary Statistic

mid term

QuestionAnswer
Probability is used as a basis for inferential statistics true
the height of the mountains in the state of alaska are an example of a variable true
the lowest level of measurement is the nominal level true
when the population of college professors is divided into groups according to their ran and then several are selected rrom each group to make up a sample, the sample is called a cluster sample false
the variable temperature is an example of a quantitative variable true
the number of ads on a one hour television show is what type of data? discrete
a researcher divided subjects into 2 groups according to gender and then selected members from each group for her sample. what sampling method was the researcher using? stratified
data that can be classified according to color are measured on what scale? nominal
a study that involves no researcher intervention is called? an observational study
two major branches of statistics are _____ and _______ descriptive and inferential
two uses of probability are ____ and _____ gambling and life insurance
the group of all subjects under study is called ______ population
a group of subjects selected from the group of all subjects under study is called a ______ sample
the four basic sampling methods are:________ stratified, systematic, random, cluster
in a research study, participants should be assigned to groups using ____ methods, if possible random
in the construction of a frequency distribution, it is a good idea to have overlapping class limits false
histograms can be drawn using vertical and horizontal bars false
frequency distributions can aid the researcher in drawing charts or graphs true
the type of graph used to represent data is determined by the type of data collected and by the researcher's purpose true
in construction of a frequency polygon, the class limits are used for the x axis false
data collected over a period of time can be graphed by using a pie graph false
what is another name fore the ogive? cumulative frequency graph
what are the boundaries for 8.6 - 8.8? 8.5 - 8.85
what graph should be used to show the relationship between the parts and the whole? pie praph
in a frequency distribution, the numbers of classes should be between __ and __ 5 and 20
data such as blood types can be organized into ______ frequency distribution categorical
data collected over a period of time can be graphed using a _____ graph time series
when the mean is computed for individual data, all the values in the data set are used true
the mean cannot be found fro grouped data when there is an open class true
a single, extremely large value can affect the median more than the mean false
one-half of all the data values will fall above the mode, and one-half will fall below the mode false
in a data set, the mode will always be unique false
the range and midrange are both measures of variation false
one disadvantage of the median is that it is not unique false
the mode and the midrange are both measures of variation false
if a person's score on an exam corresponds to the 75th percentile, then that person obtained 75% correct answers out of 100 questions. false
what is the value of the mode when all values in the data set are different? there is no mode
when data is categorized as, for example, places of residence the most appropriate measure of central tendency is the? the mode
P50 corresponds to ? D5 and Q2
which is not part of the five-number summary? the mean
a statistic that tells the number of standard deviations a data value is above or below the mean is called? a (z) score
when a distribution is bell-shaped, approximately what percentage of data values will fall within 1 standard deviation of the mean? 68%
a measure obtained from sample data is called a ____ statistic
The positive square root of the variance is call the _____ standard deviation
when the sum of the lowest data value and the highest data value is divided by 2, the measure is called _____ midrange
an extremely high or extremely low data value is called an ______ outlier
Created by: kdch0612
 

 



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