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WGU C955 – PA Test | Questions and answers
with 100% correct solutions | Graded A+
What is 3/4 divided by 2/3? A) 9/ B) 5/ C) 5/ D) 6/7 ✔✔9/ A county park has hiking paths with lengths of 1.05, 3.6, 3.17, and 2.2 miles. What is the total length, in miles, of hiking paths in the park? A) 9.02 miles B) 10.02 miles C) 10.12 miles D) 11.2 miles ✔✔10.02 miles If there are 2 tablespoons in 1 fluid ounce, how many tablespoons does the following calculation yield? 4 fl oz - 1.5 tbsp 0.5 tbsp 1 tbsp
2.5 tbsp 6.5 tbsp ✔✔6.5 tbsp Solve for X: X - 5/4 = 2/ A) 3/ B) 7/ C) 10/ D) 23/12 ✔✔23/ Solve for X: X+5/3=2/ A) - 3 B) - 1 C) 1 D) 3 ✔✔- 1 Given the inequality: 2y + 6 > 20 Which graph is the solution? A) {{ y < 3 }} B) {{ y > 6 }} C) {{ y > 7 }}
C) (0,-9) to (5,-19) D) (0,-9) to (5,-24) ✔✔(0,9) to (4.5,0) A normally distributed data set has a mean of 25 and a standard deviation of 2. Which percentage of the data falls between 23 and 25? A) 34. B) 68. C) 95. D) 99.7 ✔✔34. A given data set is normally distributed with a mean of 200 and a standard deviation of 5. Which two values does 95% of the data fall between? A) 180- 220 B) 185- 225 C) 190- 210 D) 195- 235 ✔✔ 190 - 210
In a statistics class, 40 students are asked to write their age on a piece of paper and place the paper in a box. After rotating and shaking the box, 5 pieces of paper are drawn from the box at random. The data results are as follows: 36 22 21 20 19 What is the median for this data set? A) 17 B) 21 C) 24 D) 28 ✔✔ 21 A new video gaming site wants to know what the median age is of its adolescent population so they can focus on activities for these clients. A data analyst recorded the ages of 12 adolescents who used the site over a three-month period. The results are given below: Age ,Frequency 13 , 16 ,
The bar chart below summarizes the final grade distribution for a statistics course: {{ Y = Count X = A B C D F A = 5 B = 9 C = 11 D = 8 F = 7 }} Which percentage of students earned a B in the statistics course? A) 9% B) 22.5% C) 27.5% D) 40% ✔✔22.5%
Which statement is true regarding the distribution of the histogram below? {{ Positively skewed histogram }} A) The mean of the distribution is greater than its median. B) The median of the distribution is greater than its mean. C) The mean and the median of the distribution are equal. D) The relationship between the mean and the median cannot be determined from the histogram. ✔✔The mean of the distribution is greater than its median. In one 12-hour shift, a nurse spends four hours at patient bedsides, two hours pulling medications, one hour on breaks, two hours documenting, and three hours doing other activities. An analyst would like to display the data by representing the 12-hour shift as one whole. Which display method should the analyst use to meet this goal? A) Box plot B) Stem plot C) Histogram D) Pie chart ✔✔Pie chart For which type of website data would a histogram be most appropriate? A) Length of visit in minutes
5th Bar= }} Why is this chart an inaccurate representation of the data? A) The horizontal labels are missing. B) A histogram instead of a bar chart should be used for this type of data. C) A pie chart instead of a bar chart should be used for this type of data. D) The vertical axis should start at 600 instead of 0 based on this data. ✔✔The horizontal labels are missing. Two employees, Smith and Jones, had first quarterly sales of $50,000 and $60,000, respectively. The graph below depicts this information: {{ Y=Thousands of Dollars, going from 40 to 100 in increments of 10 X= Smith Jones Smith = 50 Jones = 60 }} What is true about this graph's depiction of the data? A) The graph reflects the results perfectly.
B) The graph misrepresents the data by starting the vertical axis at 40, making it seem that Jones had twice Smith's sales. C) The graph misrepresents the data by using different colors for the bars that show Smith's and Jones's sales. D) The graph misrepresents the data by including values on the vertical axis as high as 100 when neither Smith nor Jones had sales that high. ✔✔The graph misrepresents the data by starting the vertical axis at 40, making it seem that Jones had twice Smith's sales. The chart below shows the population of Texas from 1900 through 2000 (in millions of people): {{ Y=Texas Population in millions, going from 0 to 25 in increments of 5 X=1900 1960 1970 1980 1990 2000 }} Why is this graph a misleading representation of this data? A) Rounding to the nearest million distorts the true values. B) The horizontal scale is uneven. C) The vertical scale is uneven. D) The x-axis and y-axis should be reversed. ✔✔The horizontal scale is uneven. A study was conducted to see if blood type influenced height.
B) Five-number summary C) Conditional percentages D) Correlation coefficient ✔✔Five-number summary A researcher is examining the relationship between the number of hours of sleep and score on a cognitive test. Which method should be used to measure the linear relationship between these two variables? A) Correlation B) Proportion C) Quartile D) Standard deviation ✔✔Correlation A study is conducted on the possible relationship between the number of new car purchases and national unemployment rates. Which numerical measure is appropriate for this situation? A) Standard deviation B) Five-number summary C) Correlation coefficient D) Conditional percentages ✔✔Correlation coefficient
In a simple marketing survey, consumers in three parts of a state are asked for their preference between Product A and Product B. Survey results are reported in the two-way table below: ..........Product A..Product B..Total Northern..25.........18......... Central...35.........31......... Southern..22.........27......... Total.....82.........76......... Which percentage of respondents from the Northern region prefer Product A to Product B? A) 16% B) 30% C) 52% D) 58% ✔✔58% A researcher is interested in determining purchasing preferences based on age. The researcher randomly samples people in two age groups and asks how they prefer to shop. Conditional percentages are used to summarize the responses in the table below: Purchasing Preferences ..............Online..In-Store..Total 40 and above..45%.....55%.......100% 39 and below..63%.....37%.......100%
B) People born after 1990 are less likely to be able to drive a manual transmission car than people born before 1990 because 22% is less than 78%. C) People born before 1990 are more likely to be able to drive a manual transmission car than people born after 1990 because 78% is greater than 22%. D) People born after 1990 are less likely to be abl ✔✔People born before 1990 are more likely to be able to drive a manual transmission car than people born after 1990 because 78% is greater than 16%. Which type of correlation is shown in the scatterplot below? {{ Scatterplot starting from point (10.9,13.5) to (14.6,15.2) }} A) Positive correlation B) Negative correlation C) Nonlinear correlation D) No correlation ✔✔Positive correlation {{ Scatterplot starting from point (0.2,3.58) to (1.5,3.43) where all follow a close path down and to the left }} Which type of correlation is shown in the scatterplot above? A) Strong negative linear correlation B) Strong positive linear correlation C) Weak positive linear correlation
D) Weak negative linear correlation ✔✔Strong negative linear correlation The scatterplot below depicts data of hours spent watching TV by age: {{ Scatterplot where the points appear to be random }} What is the most likely correlation coefficient? A) − B) − C) 0 D) 1 ✔✔ 0 How will removal of the outlier affect the relationship between missed work days and health rating in the scatterplot below? {{ Scatterplot trending down and to the left with an outlier below the surrounding points }} A) It will weaken the positive relationship. B) It will weaken the negative relationship. C) It will strengthen the negative relationship. D) It will strengthen the positive relationship. ✔✔It will strengthen the negative relationship.
A) Customers who have issued a complaint about the company B) Customers who have terminated their service C) Customers who have contacted the company for assistance D) All customers ✔✔All customers A local electronics store conducted a biased study. Their study focused on customer satisfaction with the IT support that they offer. They surveyed 250 randomly selected customers aged 18-25 who contacted their IT support staff. Where is the misalignment that caused the bias? A) Sampling customers that contacted IT support B) Conducting a survey C) Sampling customers aged 18- 25 D) Sampling 250 customers ✔✔Sampling customers aged 18- 25 A study is being conducted on the relationship between age and the amount of money people spend on eating out. Researchers gather data from a group of 100 people ages 50 to 65 and conclude that as people age, they tend to spend more money eating out. Is there any potential bias in this study? A) Yes, because the age group selected does not represent the entire population B) Yes, because they should also include people that do not eat out in the study
C) No, because people in that age group are more likely to afford eating out D) No, because the sample is representative of the population ✔✔Yes, because the age group selected does not represent the entire population A medical research group studying pulmonary health is working on two major studies. First study: In an attempt to study the health effects of coal dust, the group selected 4,000 subjects from four communities, two of which are home to large proportions of coal miners. The researchers followed the health of the subjects over a 12-year period. Second study: In an attempt to study interactions between environmental cigarette smoke and childhood asthma, the group selected 145 asthmatic children and their parents. The researchers followed the children's health and the smoking habits of the parents for five years. What is true regarding the two studies? A) Both studies are observational. B) Study 1 is observational; study 2 is experimental. C) Study 1 is experimental; study 2 is observational. D) Both studies are experimental. ✔✔Both studies are observational. A researcher studying the effects of chocolate on learning selects six groups of 20 mice each at random from a laboratory population. Each of the first five groups is fed different amounts of chocolate for three days in addition to their normal diet, and the last group is given a placebo. Each of the mice is then timed while running a maze.
