Name (Last, First 3- Home Assignment 1: Determine wbether the gives description

Question

Name (Last, First 3- Home Assignment 1: Determine wbether the gives description corresponds to an observational study or an nalyst selects a stock from a group of twenty for investment by choosing the stock with the Problem 1: Determine wheth reported for the last quarter A) Experiment Problem 2: Identify which of these types of sampling is used: random, stratified, systematic, cluster, comvenience greatest earnings per sh B) Observational study a) The name of each contestant is writen on a separate card, the cards are placed in a bag, and three names are picked from the hag. A) Random B) Claster C) Convenience D) Stratified E) Systematic b) To avoid working late, a quality control analyst simply inspects the first 100 items produced in a day A) Systematic B) Stratified C) Convenience D) Cluster E) Random Problem 3: Determine whether the gives valoe is from a discrete or continuous data set. a) The height of 2-year-old maple tree is 28.3 ft. A) Continuous B) Discrete Problem 4: Determine which of the four levels of measurement (sominal, ordinal, interval, ratio) is most appropriate. La Student's grades: A, B, or C, on a test. A) Interval B) Nominal C) Ordinal D) Ratio Problem 5: Determine whether the given value is a statistic or a parameter. A fter inspecting all of $5,000 kg of meat stored at the Wurst Sausage Company, it was found that 45,000 kg of the meat was spoiled A) Statistic B) Parameter Problem 6: Find the variance for the given data. Round your answer to one more decimal place than the original data 83 6661 A) 6.08 B) 3.37 C)2.33 D) 6.4 C)1.53D) A) 64 B) 2.53 A) Symmetric B) Skewed to Right C) Skewed to Left These data are: Problem 7: A school district performed a study to find the main causes leading to its students dropping out of school. Thirty cases were analyzed, and a primary cause was assigned to each case. The causes included unexcused absences an illness (1) family problems(F), and other causes (0). The resalts for the thirty cases are listed below UUUIFOOUIFFOUIFHOUIFFUUHOFU Construct a table summarizing the frequency distribution of the primary causes leading to student dropout

Explanation / Answer

1. The researcher has no control over the variables in an observational study. An experiment is a method of applying treatments to a group and recording the effects.

In an experimental study, the investigator actively manipulates which groups receive the agent or exposure under study

And as per definition given is observational study so answer is B.

2. a. This is a simple random sampling as all cards are given equal probability of selection so answer is A.

b. For his convenience he takes the first 100 which means it convenience sampling answer is C.

3. Height is continous as it can take many values between two values so answer is A.

4. An ordinal variable is a categorical variable. Observations can take a value that can be logically ordered or ranked. The categories associated with ordinal variables can be ranked higher or lower than another, but do not necessarily establish a numeric difference between each category. Examples of ordinal categorical variables include academic grades (i.e. A, B, C), clothing size (i.e. small, medium, large, extra large) and attitudes (i.e. strongly agree, agree, disagree, strongly disagree).

So answer is Ordinal answer is C.

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