Question

can you answer all please

The data in the file UsedHonda Civics come from a sample of used Honda Civics listed for sale online in July 2006. The variables recorded in this data file are the car's age calculated as 2006 minus year of manufacture) and price. Consider conducting a simulation analysis to test whether the sample data provide strong evidence of an association between a car's price and age in the population Identify the type of study. Observational study Identify the experimental/observational units in this study. Car price Identify the two variables of interest and whether each is categorical or quantitative. O Explanatory variable: age, response variable: price. Both of these are quantitative. Explanatory variable: price: response variable: age. Both of these are categorical. Explanatory variable: price, qualitative; response variable: age, categorical. Explanatory variable: age categorical; response variable: price, qualitative. State the appropriate null hypothesis in words. There is a negative association between age and price of used Honda Civics. There is an association between age and price of used Honda Civics. There is no association between age and price of used Honda Civics. There is a positive association between age and price of used Honda Civics. State the appropriate alternative hypothesis in words. There is an association between age and price of used Honda Civics. There is no association between age and price of used Honda Civics. There is a negative association between age and price of used Honda Civics. There is a positive association between age and price of used Honda Civics.

Answer 1

Type of study : Regression Analysis

Experimental or observational unit : Car's price

Two variables of interest : Option 1 is correct

Explanatory variable : age, response variable : price. Both of these are quantitative.

Null Hypothesis : There is no association between age and price of used Honda Civics. { Option 3 }

Alternative Hypothesis : There is an negative association between age and price of used Honda Civics. {Option 1 }

Using Scatterplot : Option 4 is correct .

There is fairly strong negative association between age and price of the cars.

Note we first draw a scatterplot to observe the association between the two variables and then go for test. In the scatterplot there is negative association between age and price of the cars and hence the alternative hypothesis is stated.