The range for the following data set is:  112, 156, 178, 190, 208, 259, 312, 323, 343, 356, 388, 400 (Report a numerical value)    

Suppose you want to weigh yourself. Before stepping on the scale, you pick up a 5 lb dumbbell and record your weight while holding it. You repeat this several times, and each time the measurement is a little different. What is the reason for these differences in the measurements? (Select the correct option)

Suppose packages of margarine coming from an automated processor have weights that are normally distributed. For one day’s production, the weights are well approximated by a normal curve with mean 8.5 oz and a standard deviation of 0.5. Suppose two packages are selected at random from the day’s production. If the packages of margarine are labeled 8 oz, what is the probability that both of them weigh above the labeled amount? (Assume their weights are independent).   (Report a numerical value. Round your answer to two decimal places)

Three students plot histograms (i), (ii), (iii) for the weights of subjects in a study, using the density scale. Which histogram is correct? (Select the correct option)  

Below are sketches of histograms for three lists. Match the histograms with the description.   

The ideal graph to represent the maximum temperature in degrees Fahrenheit of 7 days in Madison randomly chosen throughout the year is: (Choose the best answer).

  One appeal of eating organic foods is the belief that they are pesticide-free and thus healthier. The Consumers Union has a breakdown with the type of food and the pesticide status in a certain location. 1600 foods were reported, and 700 of them were organic. Pesticides were found in a total of 700 foods, 400 of which were conventional foods. If we pick a random food in this location, the events of being conventional and of having pesticides are independent.  (In your computations round to two decimal places to conclude).  (Select true or false)    

The following is a set of 100 normally distributed housefly wing lengths. Using the graph, an estimation of the percentage of wing lengths less than 40 mm is:         (Select the correct option)    

Dr. Weissman wants to find out how many of her patients floss regularly, so she gives out a survey asking people how many days they flossed in the last month. She created the following density histogram.   (Fill in the blanks) Identify the subject, variable, and data type of the variable being tested, and give a range of values the median could be in: Subject: Variable: Data Type: Range of values the median could be in:    

Which of the following situations could be described as bias in measurements? (Select the correct option)