Statistics Questions and Answers

vast majority

Explain how to find the value for 96% confidence level.

How do you calculate the mode when there are 3 modes

Why is the median​ resistant, but the mean is​ not? Choose the correct answer below. A. The mean is not resistant because when data are​ skewed, there are extreme values in the​ tail, which tend to pull the mean in the direction of the tail. The median is resistant because the median of a variable is the value that lies in the middle of the data when arranged in ascending order and does not depend on the extreme values of the data. B. The mean is not resistant because it is dependent upon the sample​ size, n. The larger n​ is, the smaller the mean becomes.​ However, the median is resistant because it is not dependent on the sample​ size, n. C. The mean is not resistant because when data are​ skewed, there are extreme values in the​ tail, which do not pull the mean in that direction.​ However, the median is pulled in the direction of the extreme​ values, making it resistant. D. The median is​ resistant, while the mean is​ not, because when there are extreme values in the​ tail, the value of the median changes while the mean does not.

True or False? In stratified sampling, the population is split into non-overlapping groups or strata (e.g., men and women; people under 30 years of age and people 30 years of age and older) and then sample within each strata.

"Which of the following is an example of inferential statistics? Find the average height of 50 female students at State University. Summarize the variability of the exam scores of 40 students based on all 40 exam scores. Test the longevity of all light bulbs based on a sample of 100 light bulbs. Calculate a mutual fund's average return for the last five years."

Outline the advantages and disadvantages of the use of tally charts as quantitative data.

How do I find the t* at the 0.05 significance level?

"Herramienta utilizada para análisis un gráfico de datos bivariados Ishikawa Lógico Pareto Correlación Dispersión"

Theoretical frequency distributions provide an important basis in modern statistics.' Discuss.

Explain the difference between the functions STDEV.S() and STDEV.P() in Excel. What do the .S and .P extensions mean, and when would you apply each?

"Changing the Alpha level from .05 to .01 would. A. Decrease the risk of a type one and type two error. B. Increase the risk of a type one and type two error. C. Decrease the risk of a type one error and increase the risk of a type two error. D. Increase the risk of a type one error and decrease the risk of a type two error."

"What is the 2SD formula"

Calcular la mediana de los siguientes datos: 3, 6, 7, 9, 4, 4.

"The National Center for Education Statistics reported that 47% of college students work to pay for tuition and living expenses. Assume that a sample of 450 college students was used in the study. a. Provide a 95% confidence interval for the population proportion of college students who work to pay for tuition and living expenses. (to 2 decimals) , b. Provide a 99% confidence interval for the population proportion of college students who work to pay for tuition and living expenses. (to 2 decimals) , c. What happens to the margin of error as the confidence is increased from 95% to 99%?"

Which of the following sampling methods would bias the set of responses? Select all that apply. A. Tossing a chipped number cube B. Interviewing pet owners about their pet's health C. Asking people to return a mail-in card D. Calling people between 3:00 PM and 4:00 PM

What is the five-number summary for the data 0, 2, 2, 4, 5, 5, 5, 5, 7, 11? Minimum Q1 Median Q3 Maximum When the minimum, 0, is removed from the data set, what is the five-number summary? Minimum Q1 Median Q3 Maximum

Sophia's IQ score is 85. She performed as well or better than __________ percent of her agemates. A) 16 B) 36 C) 50 D) 85

What is the interquartile range of the data set? {18,17,10,25,20,20,30,18,18,30,25} Enter the answer in the box.

How can you calculate the margin of error using a TI-84 Plus CE calculator?

"What does a correlation coefficient of +0.5 indicate about a set of data? A. Strong positive correlation. B. Strong negative correlation. C. No correlation. D. The decision is not provided."

What is the z-score with a confidence level of 95% when finding the margin of error for the mean of a normally distributed population from a sample? A. 0.99 B. 1.65 C. 1.96 D. 2.58

"In which situation is it best to use a line graph? A. When the values on both axes are numbers B. When a grade distribution is displayed C. When showing trends D. When representing parts of a whole"

An automobile manufacturer sold 30,000 new cars, one to each of 30,000 customers, in a certain year. The manufacturer was interested in investigating the proportion of the new cars that experienced a mechanical problem within the first 5,000 miles driven.(a) A list of the names and addresses of all customers who bought the new cars is available. Describe a sampling plan that could be used to obtain a simple random sample of 1,000 customers from the list.

Which could be a conditional relative frequency table? | | **B** | **B** | **Total** | | --- | --- | --- | --- | | C | 0.25 | 0.75 | 1.0 | | D | 0.35 | 0.65 | 1.0 | | Total | 0.30 | 0.70 | 1.0 | | | A | B | Total | | C | 0.75 | 0.25 | 0.50 | | D | 0.25 | 0.75 | 0.50 | | Total | 0.50 | 0.50 | 1.0 | | | A | B | Total | | C | 0.65 | 0.35 | 1.0 | | D | 0.35 | 0.65 | 1.0 | | Total | 1.0 | 1.0 | 1.0 |

How do you find the point estimate from a confidence interval?

The dot plot shows the heights of college women. The mean is 64 inches (5 feet 4 inches) and the standard deviation is 3 inches. Complete parts a and b below. a. What is the z-score for a height of 61 inches? b. What is the height of a human with a z-score of 3?

Calculate the interquartile range of the data set: {7, 3, 10, 8, 4, 1, 8, 6, 5, 8}

The director of health services is concerned about a possible flu outbreak at her college. She surveyed 100 randomly selected residents from the college's dormitories to see whether they had received a preventative flu shot. The results are shown below. What is the probability that a dormitory resident chosen at random from this group has had a flu shot, given that he is male? A)51/100 B)39/100 C)39/80 D)13/17

What is the most statistically landed-on property on a Monopoly board?

"If sample data consist of weights measured in grams, then correctly complete the following sentences: a. The unit for sample standard deviation would be ______. b. The unit for population standard deviation would be ______. c. The unit for sample variance would be ______. d. The unit for population variance would be ______."

35,43,81,30,41,95,103,43,96 What is the mean of this data set?

What are the four principles of experimental design?

"What is the class midpoint Xm, and how do you find it? A) X m is the sum of all data points divided by the number of data points. B) Xm is the middle point of a frequency distribution class. C) Xm is the mean of the lower and upper class limits. D) Xm is the mode of the data set."

Which of these r-values represents the strongest correlation? A. -0.5 B. -0.7 C. -0.4 D. -0.6

Suppose T and Z are random variables How do I solve this? a) if P(t>2.17)=0.04 and P(t<-2.17)=0.04 obtain P(-2.17<=T<=2.17) b) If P (-1.18 <=Z<=1.18)=0.76 and also P(Z>1.18)=P(Z<-1.18) Find P(Z>1.18)

Which of the statements below is true for the following set of numbers? 42, 20, 36, 51, 60, 28 The range is 14 and the midrange is 35. The range is 60 and the midrange is 39. The range is 40 and the midrange is 20. The range and the midrange are equal.

What formula can I use to predict likely winning numbers based on the past results from a 5/90 lottery system?

What does the 95% represent in a 95% confidence interval? Choose the correct answer below: A. The 95% represents the probability the interval will contain the parameter (for example, the population mean or population proportion). B. The 95% represents the proportion of intervals that will not contain the parameter (for example, the population mean or population proportion) if a large number of different samples is obtained. C. The 98% represents the probability the interval will not contain the parameter (for example, the population mean or population proportion). D. The 95% represents the proportion of intervals that would contain the parameter (for example, the population mean or population proportion) if a large number of different samples is obtained.

Which of the following is an example of a spurious correlation? A. Eating a balanced diet keeps you healthy. B. Studying more usually leads to better grades. C. People with long arms also have long legs. D. Rising poverty rates correlate to rising crime rates.