Exam 1: Discretionary Expenses

When a correlation coefficient is near 1,there is little or no correlation between corresponding variables.

If a collection of data does not have any values that occur more than once,it is considered bimodal.

Which is the regression equation for a scatterplot with these points rounded to the nearest tenth: (4,35), (6.5,92), (2,10), (5,50), (6,85), (10,110)?

Examine the frequency table below for prices to replace a dishwasher.What is the percentile rank of dishwashers that cost $325? ​

Pamela called nine repair shops for quotes for auto repairs.The prices are $139,$150,$345,$99,$167,$155,$140,$200,and $160.She thinks there is a chance that there is an outlier and the data may be skewed.Which measure of central tendency should she choose and what value would that be?

Nancy works at a health club.She notices that the clients who run on the track for a longer period of time go a longer distance.If this is a causal relationship,explain the explanatory and response variables.

A discretionary expense is one that can't be eliminated from your day-to-day life.

Your income before all taxes are deducted is your disposable income.

Mr.Joseph recently received a notice that his average gas and electric bill would increase at the beginning of the year.He went online to see the amount of his last 12 bills.If his average bill over the past 12 months goes up 17%,what can he expect to pay on average next year? ​

The American Medical Association took the resting pulse rate of all the doctors at a local hospital and published this frequency distribution.What percentile is a resting pulse of 79 beats per minute? ​

Sigma notation for determining median of 15 values is .

A frequency distribution is a table that displays each possible value and the number of times that value occurs.

Marsha was shopping for a new dishwasher and researched the different models she could afford.Using Marsha's frequency distribution table,determine the median price for dishwashers. ​

In the ordered pairs,the first coordinate is the price,p,and the second is the quantity,q: (250,5,000), (100,8,500), (450,2,000), (300,5,000), (200,4,750).When the points are plotted in a scatterplot,what is the correlation coefficient?

Robert heard that there 78 different apartments in the part of New York City he is considering moving to.The mean rental price is $1,800 with a standard deviation of $200.He is assuming his data is normally distributed and wants to know how many apartments he will have to look at if his goal rental price is $1,500.Use the standard distribution table to help Robert narrow down his search to apartments priced under $1,500.

A scatterplot is graphed with the time it takes a child to get dressed in the morning on the horizontal axis,and the child's age in years on the vertical axis.The graph shows a negative correlation because the time decreases as the age of the child increases.

The results of a recent survey showed that the average cost to rent a car for a week is $276.If the standard deviation is $60,find the z-score for a weekly rental of $423.00?

When considering measures of central tendency,the presence of outliers would indicate that the mean may not be a good representation.

Victor found five cars online that he will go and see.The prices of the cars are: $5,000;$4,500;$5,500;$3,999;and $4,999.To save time,he only wants to see cars that are within one standard deviation of the mean.How many cars will he see?

Maxine works at an amusement park.She recorded the number of ice cream cones sold each day,along with the high temperature in Fahrenheit degrees.Using her data,she wrote a linear regression equation of y = 9x - 487.If the temperature,or x,is 85°F,how many ice cream cones could Maxine expect to sell?