The monthly electric bills for a local business had a mean of 1535 dollars. The values go from 1430 to 1630 dollars. Assume that the data is normally distributed.  Which of the following is a plausible value for the standard deviation?

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 female?

Below is a histogram of a random sample of selling price of houses in Gainesville, Florida during the Spring 2017. Describe using all four characteristics.  

A least squares regression equation was computed to predict the weight (lbs) of a 3 year old toddler based on the toddler’s height (in). The equation was yhat =  5.63 + 0.618x.  (The data set included toddlers between roughly 24 and 48 inches.)  Find the predicted weight of a toddler that was 44 inches tall.

Below is a histogram of a random sample of the breakfast cereal. The histogram shows the amount of fiber per serving.  Describe using all four characteristics.

Below is a scatterplot of calories versus potassium content in cereals. What would be an approximate value of r?  

Below is the result of a class survey. The students were asked to state the make of the car they drove and their level of satisfaction with the car on scale of 1-10.   Which make of car had the smallest IQR?

Below is a table from the General Social Survey. In 1986, respondents were asked how much they agreed or disagreed with the following statement. “Welfare helps prevent hunger and starvation”.   Male Female Row Total Strongly Agree 96 132 228 Agree 455 615 1070 Disagree 58 78 136 Strongly Disagree 9 17 26 Total 618 842 1460   What is the probability that a female says that she strongly agreed?

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.

The following is an excerpt from a New York Times article; Naps May Be Good for a Baby’s Learning by Nicholas Bakalar. The article appeared on January 12th at 3pm. ” Researchers tested 6- and 12-month old babies using a puppet with a removable mitten containing a bell. The experimenter engaged the child, then removed the mitten and shook it three times to demonstrate its sound and movement, and replaced the mitten on the puppet’s hand. She repeated the procedure several times. The study was published in Proceedings of the National Academy of Sciences (Links to an external site.).   On average, the infants napped for 106 minutes during the ensuing four hours. But 21 of the 40 babies slept 30 minutes or less. The next day, after all the infants had slept soundly for the night, the researchers presented the materials again to see if the infant would remember and try to reproduce the mitten procedure. The babies who had taken long naps after the teaching session were significantly better at reproducing the procedure than those who napped less than 30 minutes.”   Are the “21 out of 40 babies(52.5%)” in this study- the statistic or the parameter?