Inferential statistics can be best described as A. carefully following a logical path to reach a conclusion from stated premises B. drawing samples from populations and describing the distributions of the sample data sets C.using samples to draw reasonable conclusions about the populations they are drawn from D. the mathematical underpinnings of randomness

If you were to draw 15 random samples of 100 residents in a city you may get 15 different mean values simply by chance. These expected differences across samples may be defined as: a. a statistical effect b. sampling error c. random error d. probability

This problem will take you through calculating the mean for grouped data by hand.The reason that the class midpoint is used in the table below is because it is the expected value for the average score in each class. Part A: Lower Class Limit Upper Class Limit Frequency Class midpoint Frequency times midpoint 60 64 13       65 69 17       70 74 15       75 79 7 77 539 80 84 5 82 410 85 89 5 87 435 90 94 3 92 276 95 99 1 97 97 100 104 1 102 102 Part B: Now add up the last column of the table above.

. Myers-Briggs: Actors Isabel Briggs Myers was a pioneer in the study of personality types. The following information is taken from MBTI Manual: A Guide to the Development and Use of the Myers-Briggs Type Indicator by Myers and McCaulley (Consulting Psychologists Press). In a random sample of 62 professional actors, it was found that 39 were extroverts. Let p represent the proportion of all actors who are extroverts. Find a point estimate for p. Find a 95% confidence interval for p. Give a brief interpretation of the meaning of the confidence interval you have found. Check Requirements Do you think the conditions np > 5 and nq > 5 are satisfied in this problem? Explain why this would be an important consideration.

The Census Bureau gives this distribution for the number of people in American households in 2016. Family size 1 2 4 6. 7 Proportion 0.28 0.35 0.15 0.13 0.06 0.02 0.01 Note: In this table, 7 actually represents households of size 7 or greater. But for purposes of this exercise, assume that it means only households of size exactly 7. Suppose you take a random sample of 4000 American households. About how many of these households will be of size 2? Sizes 3 to 7? The number of households of size 2 is about The number of households of size 3 to 7 is about

The students in an Introductory Statistics class are asked to complete a survey about study habits. (a) does the study appear to use random sampling? yes or no (b) does the study appear to use random assignment? yes or no

Histograms of random sample data are often used as an indication of the shape of the underlying population distribution. The histograms on the next page are based on random samples of size 30,50 and 100 from the same population. a. Using the midpoint labels of the three histograms, what would you say about the estimated range of population data from smallest to largest? Does the bulk of the data seem to be between 8 and 12 all in three histograms?  b. The population distribution from which the samples were drawn is symmetric and mound shaped, with the top of the mound at 10,95% of the data between 8 and 12, and 99.7% of data between 7 and 13. How well does each histogram reflect these characteristics?

Compare and contrast (a.) single-sample t tests, (b.) paired sample t tests, and (c.) independent sample ttests in terms of participants recruited, data collected from each participant, and information we need toconduct the analysis.

In a survey conducted by a reputable marketing agency, 231 of 1000 adults 19 years of age or older confessed to bringing and using their cell phone every trip to the bathroom (confessions included texting and answering phone calls). Complete parts (a) through (f) below. D. The sample size is large. E. Its value may change depending on the individuals in the survey. What is the source of variability in the random variable? A. The sample size B. The individuals selected to be in the study C. The question asked in the survey D. The marketing agency (e) Construct and interpret a 95% confidence interval for the population proportion of adults 19 years of age or older who bring their cell phone every trip to the bathroom. Select the correct choice below and fill in any answer boxes within your choice. (Type integers or decimals rounded to three decimal places as needed. Use ascending order.) OA. There is a % probability the proportion of adults 19 years of age or older who bring their cell…

a) Work this problem manually (by hand) using the procedures and formulas for ANOVA to check if the Population Means for flying time before major maintenance is required are the same for the three types of aircraft.   To help you, Sample Means and Sample Variances have been calculated below for you:                      Airbus                Boeing737            Boeing 787                        6.4                           8.7                          9.9                        7.8                           7.4                          12.8                        5.3                            9.4                         12.1                       7.4                            10.1                        10.8                       8.4                            9.2                          11.3                       7.3                            9.8                          11.5 __________________________________________________________________ Sample Mean         7.1…