This is an assignment in my business statistics class (FINA 220)This assignment consists of solving 4 problems from the textbook (Statistical Techniques in Business and Economics, 16 th Edition, McGraw-Hill), two from chapter 2 and two from chapter 3. Excel data files are provided below for each of the problem. When you solve the 4 problems, please copy the data into 4 tabs of one Worksheet before you start. Do not keep it in 4 files.Here are the problems:2.30) The weekly amounts spent on groceries for a sample of 45 households is provided in the attached file. a) How many classes would you recommend for grouping the data?b) What class interval would you suggest?c) What would you recommend as the lower limit of the first class?d) Organize the data into a frequency distribution.e) Plot the distribution using a bar chart in Excel.2.43) Merill Lynch recently completed a study regarding the size of online investment portfolios (stocks, bonds, mutual funds, and certificates of deposit) for a sample of clients in the 40 up to 50 years old age group. The value of all investments in thousands of dollars for the 70 participants in the study is provided in the attached file.a) Organize the data into frequency distribution. How many classes would you suggest ? What value would you suggest for a class interval?b) Draw a histogram. Inerpret your results.c) What is the mean, the variance, and the standard deviation of the data?3.65 A sample of households that subscribe to United Bell Company for landline phone service revealed the following number of calls received per household last week (see attached data file for the numbers). Determine the mean and the median number of calls received.3.77 The enrollments of the 13 public universities in Ohio is given in the attached data file.a) Is this a sample or a population?b) What is the mean enrollment?c) What is the median enrollment?d) What is the range of enrollments?e) Compute the standard deviation.

This week’s assignment consists of two parts. For this task, you will:Create a detailed chart of major threats to validity for conclusion, construct and external validity.Write an essay that describes the major threats and how you would minimize them for internal validity.Part 1Create a chart, noting three types of threats for conclusion, construct, and external validity. The following is an example of how you may want to organize your chart. In column 1, specify the specific threat; in column 2, provide a description of this threat; and in column 3, include a brief description of the method that is used to minimize the threat.Type of ThreatDescriptionMethod of Minimizing the ThreatConclusion123 Construct123 External123 Part 2After you have completed your chart, prepare an essay in which you thoroughly describe the major threats to validity in external validity and explain how you would minimize the threats. Support your essay with five references. Support your essay with five references.Length: 3 pages for the chart; 2-3 page essayYour chart and paper should demonstrate thoughtful consideration of the ideas and concepts presented in the course by providing new thoughts and insights relating directly to the topic. Your response should reflect scholarly writing and current APA standards.

To get started, carefully examine the data on the STAT 222 Car Details 2019 Models spreadsheet (XLSXThen, construct a hypothesis and address the following in a document.Describe what you are comparing.State your hypothesis in a sentence.Indicate the appropriate t or z that you will use to evaluate your hypothesis.State the alpha (α) level.the spreadsheet is below