UNIT 1 EXAM REVIEW (Topics 1-5)

Transcription

1 UNIT 1 EXAM REVIEW (Topics 1-5) Name Block Vocabulary: Do the attached crossword puzzle. If you need additional help, use your vocabulary sheets and some index cards. Make flash cards for all of the words and practice.

2 Crossword Puzzle Word Bank anecdote distribution placebo sample size bar graph dotplot population simple random sampling biased double blind precision statistic binary experiment quantitative unbiased blindness explanatory random assignment variability categorical lurking random digit table variable confounding observational representative control observational unit response data parameter sample

3 Topic 1 Concepts: Identify observational units and variables. Classify variables as: categorical, categorical binary, or quantitative. Topic 1 Problems: 1. Identify each type of variable for the given observational unit. Observational Unit Variable Type Cars in a parking lot Cars in a parking lot Students in Statistics Students in Statistics 4-door or 2-door Color Percent on the last quiz Letter Grade on the last quiz 2. For each situation, identify the observational unit and the variable. (Do not identify the type of variable, but what the variable is). Situation Observational Unit Variable You are flipping a coin to find the probability of it landing on heads or tails. You want to see what make of cars students at KHS tend to drive (ex: Ford, Toyota, Honda). You want to see how many grams of fat various Subway sandwiches have.

4 Topic 2 Concepts: Create bar graphs. Create dotplots. Interpret graphs (bar graphs and dotplots) within the context of the situation. Topic 2 Problems: 3. Use the data below to create a bar graph and a dotplot for the two types of data given. (Be sure to label everything accurately and appropriately.) Sandwich Calories Cheese or No Cheese Arby s Melt with Cheddar 368 Yes Arby Q 431 No Bac n Cheddar Deluxe 539 Yes Beef n Cheddar 487 Yes Giant Roast Beef 555 No Junior Roast Beef 324 No Regular Roast Beef 388 No Super Roast Beef 523 No Breaded Chicken Fillet 536 No Chicken Cordon Bleu 623 Yes Grilled Chicken BBQ 388 No Grilled Chicken Deluxe 430 Yes Roast Chicken Club 546 No Roast Chicken Deluxe 433 Yes Roast Chicken Santa Fe 436 No French Dip 475 No Hot Ham n Swiss 500 Yes Italian Sub 675 No Philly Beef n Swiss 755 Yes Roast Beef Sub 700 No Triple Cheese Melt 720 Yes Turkey Sub 550 No Roast Beef Deluxe 296 Yes Roast Chicken Deluxe 276 Yes Roast Turkey Deluxe 260 Yes Fish Fillet 529 No Ham n Cheese 359 Yes Ham n Cheese Melt 329 Yes

5 a. Dotplot: b. Bar Graph: c. Interpret the results of each graph in parts (a) and (b).

6 Topic 3 Concepts: Identify population, sample, parameter and statistic. Identify explanatory and response variables. Determine if a study is observational. Identify possible lurking or confounding variables. Determine if a sample is representative of the population. Topic 3 Problems: 4. A large study used 1,286 records from Canada s national health care system to compare the effectiveness of two ways to deliver babies. The two ways are a traditional birth and a caesarian section. The study found that 48% of the mothers delivered their babies via c-section. a. Identify the population: b. Identify the sample: c. Identify the parameter: d. Identify the statistic: e. Identify the sampling frame: f. Is the study observational or is it an experiment? g. Identify one possible lurking or confounding variable. h. Is the sample representative of the population?

7 Topic 4 Concepts: Describe how to obtain a simple random sample using a table or your calculator. Describe the affects of sample size and population size on variability and precision. Topic 4 Problems: 5. Using the delivering babies situation in the Topic 3 Problem, describe how you would use simple random sampling to obtain a representative sample of the Canadian mothers. 6. What would happen to the precision of the results in the Topic 3 Problem if simple random sampling was used to obtain the sample? 7. What would happen to the variability of the results in the Topic 3 Problem if a smaller sample of 137 mothers was used? 8. Would conducting an experiment with the expectant mothers be possible?

8 Topic 5 Concepts: Determine if a study is an experiment. Describe the benefits of random assignment on an experiment. Describe the benefits of blindness on an experiment. Describe the purpose of a placebo. Topic 5 Problems: 9. Pepsi wanted to demonstrate that Coke drinkers in fact prefer Pepsi when they taste both colas blind. Pepsi took 100 people who claimed to be Coke drinkers and set two unmarked glasses of cola in front of them. The subjects tasted each cola and stated which cola they preferred. a. Is this an experiment or an observational study? b. Was random assignment used? c. Was blindness used? d. Was a placebo used? e. Draw a flow chart showing the design of this study: