Lifetimes of Wristwatches A random sample of the lifetimes of 30 inexpensive wristwatches has a standard deviation of 4.6 months. Assume the variable is normally distributed. Use the chi-square distribution table to find any chi-square values to three decimal places. Round your final answers to one decimal place. Find the 80% confidence intervals for the variance and standard deviation. ? < o2 < ? ? < o < ?

Age of College Students Find the 80% confidence intervals for the variance and standard deviation of the ages of seniors at Oak Park College if a random sample of 23 students has a standard deviation of 2.5 years. Assume the variable is normally distributed. Use the chi-square distribution table to find any chi-square values to three decimal places. Round the final answers to one decimal place.

Cost for standard veterinary services at a local animal hospital follows a Normal model with a mean of $80 and a standard deviation of $20. Fill in the blanks according to this model: The middle 95% of veterinary bills cost between $ type your answer.... 2 type your answer... type your answer... Previous 3 S 3 e d 4 % of veterinary bills are between $60 and $80. % of bills are between $20 and $140. r f % 5 t 9 A 6 y h & 7 and $ type your answer... U n ★ 8 i E 9 k ✔ O P ctri

Fast-Food Bills for Drive-Thru Customers A random sample of 50 cars in the drive-thru of a popular fast food restaurant revealed an average bill of $19.19per car. The population standard deviation is $6.30.   Estimate the mean bill for all cars from the drive-thru with 91% confidence. Round intermediate and final answers to two decimal places. Question $____<U< $______

Data from a state indicate that scores on the SAT test are normally distributed with a mean of 994 and a standard deviation of 204. Scores on the ACT test are normally distributed with a mean of 20 and a standard deviation of 5.1. It is assumed that the two tests measure the same aptitude, but use different scales.If a student gets an SAT score that is the 77 percentile, find the actual SAT score. Round answer to a whole number. SAT score = What would be the equivalent ACT score for this student? Round answer to 1 decimal place. ACT score = If a student gets an SAT score of 1280, find the equivalent ACT score. Round answer to 1 decimal place. ACT score =

Normal Distribution The following table shows the temperature at noon on February 21, 2018 in 5 different Canadian cities. Calculate the z-score for each temperature measurement, and find which city was experiencing the most "exceptional" (out-of-ordinary) temperature on that day. City Temp. on February 21 Average Temp. in February Std. Deviation z-score Montreal 3.4 -7.7 2.7   Toronto 3.2 -4.5 2.3   Vancouver -3.3 4.9 1.5   Regina -27 -11.7 4.2   Halifax 5.4 -5.2 2   The city with the most "exceptional" (out-of-ordinary) temperature on that day is choose: -Montreal -Toronto -Vancouver -Regina -Halifax

Baseball Team Batting Averages Team batting averages for major league baseball in a certain year are represented below. Find the variance and standard deviation for each league. Compare the results. Round the answers to five decimal places for variance and four decimal places for standard deviation. National League 0.252-0.256 0.257-0.261 0.262-0.266 0.267-0.271 0.272-0.276 Send data to Excel Bart: 02 7 3 2 2 2 American League 0.256-0.261 0.262-0.267 0.268-0.273 0.274-0.279 0.280-0.285 2 4 7 FAD 00 8 → 民團』。 B M dh

Ages of Passenger Cars The average age of passenger train cars is 19.4 years. If the distribution of ages is normal and 18% of the cars are older than 23.5 years, find the standard deviation. Round z-value calculations to 2 decimal places and final answer to 2 decimal places. The standard deviation must be years. X Ś