welders in the Atlanta, Georgia, area. 50 100 40 40 30 20 20 Frequency 10 10 15 75 Percent 50 50 20 0 5 10 15 Hourly wage 25 25 25 25 a. How many welders were studied? Number of welders b. What is the class interval? Class interval 30 30 0
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- Data was collected on salaries of compliance specialists in corporate accounting firms. The salaries ranged from $63,000 to $303,000. a. If these values are grouped into six class intervals, indicate the class boundaries. b. What class interval width was chosen? c. What are the six class midpoints?The following is the number of minutes to commute from home to work for a group of 25 automobile executives. 51 29 30 34 44 27 52 24 57 31 40 45 40 43 40 36 39 36 48 42 39 43 48 38 33 a. How many classes would you recommend? b. What class interval would you suggest?The following is the record of ratings of 40 players in a tournament. 65 85 91 58 43 86 73 33 76 80 57 33 53 29 40 27 72 19 51 67 37 4 18 92 13 45 61 39 23 22 22 41 27 51 63 47 19 35 39 72 (a) Find the number of classes or intervals required and the class width
- Data was collected on salaries of compliance specialists in corporate accounting firms. The salaries ranged from $70,000 to $310,000. a. If these values are grouped into six class intervals, indicate the class boundaries. b. What class interval width was chosen? c. What are the six class midpoints? a. Indicate the class boundaries.The mean waiting time at the drive-through of a fast-food restaurant from the time an order is placed to the time the order is received is 87.6 seconds. A manager devises a new drive-through system that she believes will decrease wait time. As a test, she initiates the new system at her restaurant and measures the wait time for 10 randomly selected orders. The wait times are provided in the table to the right. Complete parts (a) and (b) below.A veterinarian wishes to test dogs colorblindness. She puts dog food in 3 different color bowls and expects the results to be uniform. She samples 150 dogs and find the following observation. Color Green bowl 59 Blue bowl 44 Red bowl 47 Test the veterinarian’s claim at α = .10
- Is it a general rule to follow when grouping into class intervals to strive for as few classes as possible?A construction company has twenty workers. The company classified the workers into two groups: skilled workers and semi-skilled workers according to their qualifications. It pays the mean monthly wage of (1000$) for the workers. The company usually pays high wages for skilled workers. While skilled workers receives (1180$), semi-skilled workers receives (730$). Find the number of semi-skilled workers?Which set of measures
- A state legislator wishes to survey residents of her district to see what proportion of the electorate is aware of her position on using state funds to pay for abortions. (Round your answers up to the nearest integer.) (a) What sample size is necessary if the 95% CI for p is to have a width of at most 0.12 irrespective of p? 263 people If the legislator has strong reason to believe that at least 6/7 of the electorate know of her position, how large a sample size would you recommend to maintain a width of at most 0.12?Monica, a chef at a 5-star restaurant makes eight different desserts. She wants to see if the customers prefer any specific dessert to another. She keeps a record of desserts ordered over the course of several weeks, and the results are summarized in the table below. Is there sufficient evidence to conclude that the customers prefer some specific dessert to another? Use α=0.025 Dessert Frequency Chocolate Mousse 25 Baked Alaska 14 Orange Cheesecake 23 Caramel Flan 32 Banana Broulee 40 Mississippi Mud Pie 20 Ricotta Cannoli 38 French Walnut Torte 34 x =c(25,14,23,32,40,20,38,34)chisq.test(x) What is the null hypothesis? Answer 1 What is an appropriate alternative hypothesis? Answer 2 Compute the test value. Answer 3 Find the p-value. Answer 4 Is there sufficient evidence to support the alternative hypothesis?As part of a sixth-grade class project the teacher brings to class a jar containing 200 gumballs of two different colors: red and green. Andy is asked to draw a sample of his own choosing and estimate the number of red gumballs in the jar. Andy draws a sample of 25 gumballs, of which 8 are red and 17 are green. Use Andy's sample to estimate the number of red gumballs in the jar. There are approximately Answer red gumballs in the jar.