in a recent poll 13% of all respondents said they are afraid of heights

d). What is the pmf? 3) What is the median, ã ?

In a survey that asked individuals about their favorite styles of music, 37 replied rock, 27 said they preferred pop music, 14 stated they like classical music the most, and 3 individuals stated they preferred opera. Based on this data, what would be the mode? Why couldn’t the mean or median be used to describe this set of values?

The scores on the Wechsler Adult Intelligence Scale are approximately Normal, with ?=100 and ?=15 . The score needed to be among the highest 10% of all scores is closest to:

If all the data points are in and around the central tendency measure, the dispersion is said to be O a. Low O b. High Oc. Medium O d. Normal

When a researcher changes their data analyses to get the p-value they desire, that is known as  a. HARKing b. p-hacking c. multiple comparisons d. a Type II error

A polling company conducts an annual poll of adults about political opinions. The survey asked a random sample of 434 adults whether they think things in the country are going in the right direction or in the wrong direction 42% said that things were going in the wrong direction. Complete parts a and b below. ​ a) Calculate the margin of error for the proportion of all adults who think things are going in the wrong direction for 95% confidence.

What is a Type I error in this​ problem?     A. A Type I error would be to conclude that the true mean level of support for sustainability is not 66 ​when, in​ fact, the mean is equal to 66.   B. A Type I error would be to conclude that the sample mean level of support for sustainability is greater than 66 ​when, in​ fact, the sample mean is less than 66.   C. A Type I error would be to conclude that the true mean level of support for sustainability is 66 ​when, in​ fact, the mean is not equal to 66.   D. A Type I error would be to conclude that the sample mean level of support for sustainability is less than 66 ​when, in​ fact, the sample mean is greater than 66.

Suppose the null hypothesis is not rejected. State the conclusion based on the results of the test. Six years​ ago, 11.1​% of registered births were to teenage mothers. A sociologist believes that the percentage has decreased since then.

A new treatment is discovered that improves survival probability from 85 to 95 percent. Discuss the different ways a researcher might look at these results versus the way that the marketing department might discuss them.  What is the difference in the way you would view new treatment that improves survival probability by the same absolute magnitude, say, from 5 to 15 percent?