4 STAT Homework Questions

1. 

Babies bom weighing 2500 grams or less are called low-birthweight babies, and this condition sometimes indicates health problems for the infant. The mean birth weight for children born in a certain country is about 3448 grams. The mean birth weight for babies born one month early is 2600 grams. Suppose both standard deviations are 460 grams. Also assume that the distribution of birth weights is roughly bell-shaped. Complete parts a through c below. a. Find the standardized score (z-score), relative to all births in the country, for a baby with a birth weight of 2500 grams. 2 = D (Round to two decimal places as needed.) This list represents the number of paid vacation days required by law for different countries. Complete parts a through c below. % Country A 0 Country B 20 Country C 20 Country D 10 Country E 24 Country F 14 a. Find the mean, rounding to the nearest tenth of a day. Interpret the mean in this context. The mean is D days. (Type an integer or a decimal. Round to the nearest tenth as needed.) The following data represent the number of drive-thrus of a certain restaurant within ve kilometres of the centre of cities in two regions. Complete parts a and b below. Region A: 0, 2, 3, 3, 3, 6, 6, 6, 6, 7,8,9,9,10, 10,10 |3 Region B: 0, 1, 2, 2, 3, 3, 4, 5, 5, 6, 6, 7, 9, 11, 12 a. Compare the typical number of drive-thrus in the two regions. The median number of drive-thrus is 6 drive-thrus for cities in Region Aand 5 drive-thrus for cities in Region B, showing that cities in Region A typically have more drive-thrus near the city centre. (Type integers or decimals. Do not round.) b. Compare the interquartile ranges of the number of drive-thrus. The interquartile range of the number of drive-thrus is D for cities in Region A and D for cities in Region B, showing that there is more variation in the number of drive-thrus near the (Type integers or decimals. Do not round.) The boxplot shows the number of millionaires by region per 1000 residents for a certain country. Assume Region A- all distributions are unimodal. Use the Region B- OO O boxplot to complete parts a through e below. Region C- Region D- 12.5 15.0 17.5 20.0 22.5 Millionaires ner 1000 Residents . . . . a. List the regions from lowest to highest in terms of the median rate of millionaires in that region