Blog

Which of the following is a discrete quantitative variable about tomatoes grown in a garden?

Does someone’s current age affect what they think is an appropriate retirement age? People were polled about both their current age and what they thought would be an appropriate retirement age. They wanted to predict the “appropriate retirement age” by using their current age. The data below is only for female participants.   The average of current age was 33.15 and the standard deviation was 13.93 . The average of appropriate age of retirement was 62.07 and the standard deviation was 8.10. The value for correlation was 0.1616 .   Find the least squares regression equation.

Tests for allergies can be done in multiple ways. One way is through a blood test. ImmunoCAP is one of such tests. About 0.5% of adults have tree nut allergies at some level of severity. The test correctly identifies 94% of the time adults with a tree nut allergy and correctly identifies those without tree nut allergies 93% of the time.   What is the probability of an adult having a tree nut allergy and the test being positive?

The below stem and leaf plot states the sepal (a part of the flower – usually green) width(cm) of a sample of 150 irises.     What is the minimum sepal width?

Below is a contingency table from the results of the 2012 General Social Survey. Respondents were asked to identify how much they understood issues facing the country. Responses were broken down by gender.   1:None 2:A little 3:Some 4:Quite a Bit 5:A great deal Male 14 51 140 89 23 Female 16 69 138 58 16   What is the conditional probability that someone knows “a little” given that they were male?

A survey was conducted of college students in the US. They were asked to give their own height as well as the height that they would like their mate to be. Below is the least squares regression output for this data. The output below was conducted on only the male respondents. What is the predicted height for a mate of a 58 inch tall respondent?  

In the May 1, 2014 article, “For Many, Mobile Technology Increasing Retail Shopping, Young Adults More Likely To Say Mobile Tech Increasing Retail Shopping” by Jeffrey M Jones, the results of a recent poll about Americans buying habits. Here is a quote from that article. “Results for this Gallup poll are based on telephone interviews conducted March 21-23, 2014, on the Gallup Daily tracking survey, with a random sample of 1,505 adults, aged 18 and older living in all 50 U.S. States and the District of Columbia.” What aspect of statistics is this describing?

In the Spring of 2017, a sample of 102 homes for sale in Gainesville was collected. The sale price and square footage of the homes were recorded.  The least squares regression equation was price = -58857+162.9*foot  For one house, the square footage was 952 and the price was 149900 dollars. Find the residual. 

In the Spring of 2017, a sample of 102 homes for sale in Gainesville was collected. The sale price and square footage of the homes were recorded.  The least squares regression equation was price = -58857+162.9*foot  For one house, the square footage was 2424 and the price was 299900 dollars. Find the residual. 

Suppose that you had a random number generator that randomly selected values between 0 and 1. Assume that each number is equally likely between 0 and 1 – including decimals. What is the probability that you would select a value between 0.25 and 0.5?