Stats test Prep

The following data represents the number of Sony TVs sold per day at a particular Costco over a random sample of five business days. 9 2 7 7 5 The mode of this sample is ________.

7

The MCAT is the admission exam that medical schools use as one of the criteria for accepting students. The exam is based on a scale of 0-45. The following data shows the MCAT scores for nine students. 32 36 29 31 30 35 34 26 30 What percentile is the student who scored a 35 on the MCAT exam?

83rd

There are five rows of students seated in a statistics class. The following table shows the number of students in each row and the average score of the most recent exam for that row. Row # of Students Row Average 1 6 82.3 2 7 91.4 3 4 85.0 4 5 78.3 5 6 89.1 What is the average exam score for this class?

85.7

________ classes are classes with boundaries that do not overlap.

Mutually exclusive

________ data use descriptive terms to measure or classify something of interest.

Qualitative

________ data use numerical values to describe something of interest either by measuring it or counting it.

Quantitative

________ display the proportion of observations of each class relative to the total number of observations.

Relative frequency distributions

________ is a single value used to describe the center point of a data set.

Central tendency

________ probability is used when we know the number of possible outcomes of the event of interest and the total number of possible outcomes in the sample space.

Classical

________ are values that can take on any real numbers, including numbers that contain decimal points. This data is often the result of measuring observations rather than counting them.

Continuous

________ totals the proportion of observations that are less than or equal to the class at which you are looking.

Cumulative relative frequency distributions

________ provide a picture of the relationship between two data points that are paired together.

Scatter plots

________ probability represents the likelihood of a single event occurring by itself.

Simple

________ is (are) derived from facts for the purpose of making decisions.

Information

A ________ is a graph showing the number of observations in each class of a frequency distribution.

histogram

Holiday Inn would like to estimate the satisfaction level of its customers. A sample of 25 hotels were selected and the customers at these locations were asked to rate their experience on a scale of 1-10. Based on this sample data, Holiday Inn will draw a conclusion about the satisfaction level of their customers. This is an example of using _____________.

inferential statistics

A _____ chart is a special type of scatter plot in which the data points in the scatter plot are connected with a line.

line

The ________ is the most commonly used measure of central tendency

mean

The ________ is the value in the data set for which half the observations are higher and half the observations are lower.

median

The ________ is the value that appears most often in a data set.

mode

A ________ is a portion of a population that is representative of the population from which it is selected.

sample

Data that describe a characteristic about a sample is known as a ________.

statistic

The main drawback to using secondary data is that _______________________.

you have no control over how the data were collected

The following data represents the number of Sony TVs sold per day at a particular Costco over a random sample of five business days. 9 2 7 7 5 The median of this sample is ________.

7

Which of the following is an example of quantitative data?

Apple's closing stock price today

The following data represents the ages of a household that consists of five people. 39 37 12 7 7 The mode of this data set is ________.

7

The following distribution shows the frequency of daily revenue for an Italian restaurant in Wilmington, Delaware. Revenue Frequency Under $2,000 18 $2,000 to under $4,000 10 $4,000 to under $6,000 26 $6,000 to under $8,000 14 $8,000 to under $10,000 8 Over $10,000 4 What is the width of each class for this distribution?

$2,000

The following data represents the number of days that 10 homes were on the market before being sold. 47 95 113 116 57 72 51 12 109 20 The 70th percentile of this data set is ________.

102

Seconds to Load Number of Phone Users 0 to under 5 seconds 4 5 to under 10 seconds 7 10 to under 15 seconds 3 15 to under 20 seconds 10 20 to under 25 seconds 1 What is the approximate average number of seconds that this web page took to load on the iPhone?

11.9

The following data represents the ages of a household that consists of five people. 39 37 12 7 7 Assuming this household represents a population, the mean of this data set is ________.

20.4

The first quartile represents the ________ percentile of the data set

25th

The following data represents the ages of a household that consists of five people. 39 37 12 7 7 The range of this data set is ________.

32

A data set has 60 observations with a minimum value equal to 30 and a maximum value equal to 72. The number of classes using the 2^k>=n rule is

6

The following data represents the number of Sony TVs sold per day at a particular Costco over a random sample of five business days. 9 2 7 7 5 The mean of this sample is ________.

6

A data set has 60 observations with a minimum value equal to 30 and a maximum value equal to 72. The estimated class width using the 2k >= n rule to determine the number of classes is

7

Which of the following is not a rule for constructing a frequency distribution using grouped quantitative data?

Avoid close-ended classes.

________ data are values based on observations that can be counted and are typically represented by whole numbers.

Discrete

Consider the following frequency distribution. Number of Minutes Frequency 0 to less than 5 6 5 to less than 10 9 8 to less than 13 14 13 to less than 18 2 Which rule for constructing a frequency distribution using grouped quantitative data has been violated?

Use mutually exclusive classes.

A ________ sample does not represent the intended population and can lead to distorted findings.

biased

The class ________ represent the minimum and maximum values for each class of a frequency distribution using grouped quantitative data.

boundaries

A(n) ________ is a category in a frequency distribution.

class

Calculating the probability of drawing three aces with a random sample of five cards from a standard 52-card deck is using ________ probability.

classical

Two six-sided die are rolled. Calculating the probability of the sum of the two die being a 10 is an example of using ________ probability.

classical

According to climate data recorded since 1884, the average annual snowfall in Philadelphia is 22.3 inches. This value is an example of _______________.

descriptive statistics

Your business statistics class had an exam last week. The average exam score for the class is an example of ______________.

descriptive statistics

A method of gathering data while the subjects of interest are in their natural environment, often unaware they are being watched, is known as ____________.

direct observation

The process of measuring or observing an activity for the purpose of collecting data is known as a(n) ____________.

experiment

A method of gathering data when subjects are exposed to certain treatments and the data of interest is recorded is known as ____________.

experiments

A method of gathering data when individuals are paid to discuss their attitudes towards products or services in a group setting controlled by a moderator is known as ____________.

focus groups

A ________ is a table that shows the number of data observations that fall into specific intervals.

frequency distribution

Data that describe a characteristic about a population is known as a ________.

parameter

A ________ represents all possible subjects of interest.

population

The ________ can found by subtracting the lowest value from the highest value in the data set

range

The number of iPhones sold today at an Apple store is an example of ________ data.

ratio

The following table shows the number of bagels sold at the Avalon Coffee and Bagel over the past seven days. Day Number Sold Monday 69 Tuesday 63 Wednesday 88 Thursday 74 Friday 120 Saturday 197 Sunday 226

time series

The following table shows the stock price for Facebook at the end of the past four quarters. Quarter Year Stock Price 4 2012 $25.91 1 2013 $25.73 2 2013 $24.88 3 2013 $51.24

time series