LAST KHAN EVER GUIDE WITH ACTUAL

LAST KHAN EVER GUIDE WITH ACTUAL

QUESTIONS AND ANSWERS VERIFIED 100%;

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A city had an unemployment rate of 7%7%7, percent. The mayor pledged to lower this figure and

supported programs to decrease unemployment Ans ✔✔- H0:p=7%

Ha:p<7%

A newspaper report claims that 30%30%30, percent of all tea-drinkers prefer green tea to black tea. Leo is the office manager at a company with thousands of employees. Ans ✔✔- ...equal to 30%30%30, percent.A quality control engineer is testing the battery life of a new smartphone. The company is advertising that the battery lasts 242424 hours on a full-charge, but the engineer suspects that the battery life is actually less than that. They take a random sample of 505050 of these phones to see if their average

battery life is significantly less than 2424 Ans ✔✔- H0:μ=24 hours

Ha:μ<24 hours

type ii error-b A healthcare provider saw that 48%48%48, percent of their members received their flu shot in a recent year. The healthcare provider tried a new advertising strategy in the following year, and they took a sample of members to test if the proportion who received their flu shot had changed. Ans ✔✔- H0

:p=48%

Ha:p=48%

Lena is a college basketball player who has made 75%75%75, percent of the free-throws she has attempted in her career. She decided to practice a new technique for shooting her free-throws. Ans ✔✔- ...not equal to 75%75%

A restaurant owner installed a new automated drink machine. The machine is designed to dispense 530 mL530 mL530, start text, space, m, L, end text of liquid on the medium size setting. Ans ✔✔- H0:μ=530 mL

Ha:μ>530 mL

A fair coin should land showing tails with a relative frequency of 50%50%50, percent in a long series of

flip Ans ✔✔- H0:p=50%

Ha:p>50%

Reports say that the mean birth weight of babies of European heritage is 3.5 kg3.5 kg3, point, 5, start text, space, k, g, end text. Marta wants to perform a significance test to see if this holds true in her nation. Ans ✔✔- ...equal to 3.5 kg3.5 kg3, point, 5, start text, space, k, g, end text.A fast-food company advertises that the pre-cooked weight for its burgers is, on average, 0.2 kg0.2 kg0, point, 2, start text, space, k, g, end text. The company runs a regular quality control test that involves weighing a sample of burgers to see if the burgers are too light or too heavy. If the sample mean weight is significantly different than 0.2 kg0.2 kg0, point, 2, start text, space, k, g, end text, then they recycle the entire batch. Ans ✔✔- H0Ha:μ=0.2 kg:μ=0.2 kg d A ketchup company regularly receives large shipments of tomatoes. For each shipment that is received, a supervisor takes a random sample of 500500500 tomatoes to see what percent of the sample is bruised and performs a significance test. If the sample shows convincing evidence that more than 10%10%10, percent of the entire shipment of tomatoes is bruised, then they will request a new shipment of

tomatoes. Ans ✔✔- H0:p=0.1

Ha:p>0.1

The National Sleep Foundation recommends that teenagers aged 141414 to 171717 years old get at least 888 hours of sleep per night for proper health and wellness. Ans ✔✔- ...less than 8 hours.A local pizza store knows the mean amount of time it takes them to deliver an order is 454545 minutes after the order is placed. The manager has a new system for processing delivery orders, and they want to test if it changes the mean delivery time. They take a sample of delivery orders and find their mean delivery time is 484848 minutes. Ans ✔✔- a

A nutritionist suspected that her company's clients had below average cholesterol. They obtained a random sample of 888 clients of the same age and gender. These clients had a mean cholesterol level of x =4.28 mmol/Lx =4.28 mmol/Lx, with, \bar, on top, equals, 4, point, 28, start text, space, m, m, o, l, ˉ ˉ slash, L, end text (millimoles per liter). Ans ✔✔- B .05 An economist read a report that claimed that 60%60%60, percent of residents in her large city owned their homes. She wondered if that figure was still accurate, so she took a random sample of n=50n=50n, equals, 50 residents in the city and observed that p^=70%p^=70%p, with, hat, on top, equals, 70, percent of those sampled owned their homes. Ans ✔✔- D A class in New Zealand found a report suggesting that teenagers' heights in New Zealand are approximately normally distributed with a mean of 160 cm160 cm160, start text, space, c, m, end text and a standard deviation of 15 cm15 cm15, start text, space, c, m, end text. They thought the mean height at their school was probably larger, so they took a random sample of n=24n=24n, equals, 24students. The mean height of students in their sample was x =166.5 cmx =166.5 cmx, with, \bar, on ˉ ˉ top, equals, 166, point, 5, start text, space, c, m, end text. Ans ✔✔- C Mr. Jensen told his class that he plays basketball frequently, and he claimed that he could make 80%80%80, percent of his free-throw attempts. The class suspected that Mr. Jensen was actually less than an 80%80%80, percent free-throw shooter. To test their theory, they had Mr. Jensen shoot a series of 404040 free-throws. He made p^=60%p^=60%p, with, hat, on top, equals, 60, percent of them. Ans

✔✔- A

A large school district knows that 75%75%75, percent of students in previous years rode the bus to school. Administrators wondered if that figure was still accurate, so they took a random sample of n=80n=80n, equals, 80 students and found that p^=65%p^=65%p, with, hat, on top, equals, 65, percent of those sampled rode the bus to school. Ans ✔✔- B t is commonly said that 10%10%10, percent of people are left-handed, but Lilianna suspected that a higher proportion of art students at her university are left-handed. To test this theory, she took a sample of 150150150 art students and found that p^=14%p^=14%p, with, hat, on top, equals, 14, percent of the sample was left-handed. Ans ✔✔- C The ages of workers in a certain industry are approximately normally distributed with a mean of 303030 years and a standard deviation of 3.53.53, point, 5 years. A recruiter wondered if that held true for workers in a certain state. The recruiter took a random sample of n=3n=3n, equals, 3 of these workers

from the state, and the mean age of the workers in the sample was x =26x =26x, with, \bar, on top, ˉ ˉ equals, 26 years. Ans ✔✔- c p-value≈0.07 Evie read an article that said 6%6%6, percent of teenagers were vegetarians, but she thinks it's higher for students at her large school. To test her theory, Evie took a random sample of 252525 students at her school, and 20%20%20, percent of them were vegetarians. Ans ✔✔- D A class found a report suggesting that teenagers' foot lengths are approximately normally distributed with a mean of 23 cm23 cm23, start text, space, c, m, end text and a standard deviation of 2.6 cm2.6 cm2, point, 6, start text, space, c, m, end text. They wondered if this held true at their school, so they took a random sample of n=9n=9n, equals, 9 students. The mean foot length of students in their sample was x =24.6 cmx =24.6 cmx, with, \bar, on top, equals, 24, point, 6, with, \bar, on top, start text,

ˉ ˉ ˉ ˉ

space, c, m, end text. Ans ✔✔- D .08 A factory produces ball bearings whose diameters are meant to have a mean of 3 mm3 mm3, start text, space, m, m, end text. Suppose that the actual sizes are normally distributed with a mean of 3 mm3 mm3, start text, space, m, m, end text and a standard deviation of 0.2 mm0.2 mm0, point, 2, start text, space, m, m, end text. The overseers took a random sample of n=100n=100n, equals, 100 ball bearings to see if their mean diameter was significantly different than the target. The mean diameter of the ball bearings in the sample was x =2.96 mmx =2.96 mmx, with, \bar, on top, equals, 2, point, 96, start text, ˉ ˉ space, m, m, end text. Ans ✔✔- D Elian heard that spinning a coin on a flat surface—rather than flipping it—made the probability of the coin landing showing "heads" something other than 50%50%50, percent. To test this theory, he spun a nickel a series of 808080 times and observed that p^=60%p^=60%p, with, hat, on top, equals, 60, percent of the spins landed showing "heads." Ans ✔✔- C It is commonly said that 10%10%10, percent of people are left-handed, but Lilianna suspected that a higher proportion of art students at her university are left-handed. To test this theory, she took a sample of 150150150 art students and found that p^=14%p^=14%p, with, hat, on top, equals, 14, percent of the sample was left-handed. Ans ✔✔- C An employee at an aquarium monitors how much their sea otters eat. The amount of food a particular otter eats daily is approximately normally distributed with a mean of 171717 pounds and a standard deviation of 111 pound. They suspected this otter was not eating enough, so they took a random sample