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QR Challenge: Ho and Ha

Created using the ClassTools QR Treasure Hunt Generator

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Teacher Notes

A. Prior to the lesson:

1. Arrange students into groups. Each group needs at least ONE person who has a mobile device.

2. If their phone camera doesn't automatically detect and decode QR codes, ask students to

3. Print out the QR codes.

4. Cut them out and place them around your class / school.

B. The lesson:

1. Give each group a clipboard and a piece of paper so they can write down the decoded questions and their answers to them.

2. Explain to the students that the codes are hidden around the school. Each team will get ONE point for each question they correctly decode and copy down onto their sheet, and a further TWO points if they can then provide the correct answer and write this down underneath the question.

3. Away they go! The winner is the first team to return with the most correct answers in the time available. This could be within a lesson, or during a lunchbreak, or even over several days!

C. TIPS / OTHER IDEAS

4. A detailed case study in how to set up a successful QR Scavenger Hunt using this tool can be found here.

Questions / Answers (teacher reference)

Question

Answer

1. A civil rights group feels that the selection of contestants on a game show program is biased against blacks. The U.S. Census Bureau reports that 12.7% of all U.S. citizens are black. Suppose we can assume that the contestants who have already appeared may be treated as essentially a random sample drawn from all contestants who may ever appear. Of these appearing contestants there have been 212 whites (nonHispanic), 13 blacks, 17 Hispanics, and 3 Asians. Test the groups claim: state hypotheses, compute the test statistic and obtain the P-value. Interpret the P-value. Is there sufficient evidence to conclude that the civil rights group is correct? Use a 1% significance level to make a decision. ho: p= .127, ha: P<.127, p-value=.0003, reject the null
2. The manufacturer of a particular brand of microwave popcorn claims that only 2 percent of its kernels of corn fail to pop. A competitor, believing that the actual percentage is larger, tests 2,000 kernels and finds that 44 failed to pop. Do these results provide sufficient evidence to support the competitor’s belief?ho: p= .02, ha: P>.02, p-value=.2424, fail to reject the null
3. USA Today reported that in 1992, 39% of all elementary school children claimed that when they grow up they want to do something to help other people. However, in 1995, 128 of a random sample of 317 of these same children claimed that when they grow up they want to do something to help other people. Does this information indicate that there has been an attitude change either way?ho: p= .39, ha: Pdoes not =.39, p-value=.6892, fail to reject the null
4. Back in the year 2000, a poll was done with the workers at the Pentagon (approximately 30,000 workers) to determine what percentage of the workers bought lunch in the cafeteria on a regular basis. The percentage was 18.4%. It is thought that with a greater selection, a greater percentage of people buy lunch currently. It is too difficult to ask every worker so a random sample of the 250 workers was used. It was found that 61 people buy their lunch on a regular basis.ho: p= .184, ha: P> .184, p-value=.0082, reject the null
5. “The nature of work is changing at whirlwind speed. Perhaps now more than ever before, job stress poses a threat to the health of workers and, in turn, to the health of organizations.” So says the National Institute for Occupational Safety and Health. Employers are concerned about the effect of stress on their employees. Stress can lower morale and efficiency and increase medical costs. A large survey of restaurant employees found that 75% reported that work stress had a negative impact on their personal life. The human resources manager of a chain of restaurants is concerned that work stress may be affecting the chain’s employees. She asks a random sample of 100 employees to respond yes or no to the questions, “Does work stress have a negative impact on your personal life?” Of these, 68 say “yes.” Is there evidence to conclude that the proportion for this chain of restaurants differs from the value given for the national survey? Use the appropriate inference procedure to support your answer.ho: p=.75, ha: p does not = .75, pvalue=1.89, fail to reject.
6. “The nature of work is changing at whirlwind speed. Perhaps now more than ever before, job stress poses a threat to the health of workers and, in turn, to the health of organizations.” So says the National Institute for Occupational Safety and Health. Employers are concerned about the effect of stress on their employees. Stress can lower morale and efficiency and increase medical costs. A large survey of restaurant employees found that 75% reported that work stress had a negative impact on their personal life. The human resources manager of a chain of restaurants is concerned that work stress may be affecting the chain’s employees. She asks a random sample of 100 employees to respond yes or no to the questions, “Does work stress have a negative impact on your personal life?” Of these, 68 say “yes.” 2. Construct and interpret a 95% confidence interval for the proportion of employees that say stress is affecting their personal life..5886 to .7714
7. Larry, a starting player for a major college basketball team, made only 40% of his free throws last season. During the summer, he worked on developing a softer shot in hopes of improving his free throw accuracy. In the first eight games of the season, Larry made 25 free throws in 40 attempts. You want to investigate whether Larry’s work over the summer will result in a higher proportion of free throw successes this season. Construct and interpret a 90% confidence interval for the proportion of free throws Larry will make this season..4995 to .7505

 


Ho and Ha: QR Challenge

https://www.classtools.net/QR/decode.php?text=A_civil_rights_group_feels_that_the_selection_of_contestants_on_a_game_show_program_is_biased_against_blacks._The_U.S._Census_Bureau_reports_that_12.7%_of_all_U.S._citizens_are_black._Suppose_we_can_assume_that_the_contestants_who_have_already_appeared_may_be_treated_as_essentially_a_random_sample_drawn_from_all_contestants_who_may_ever_appear._Of_these_appearing_contestants_there_have_been_212_whites_(nonHispanic),_13_blacks,_17_Hispanics,_and_3_Asians._Test_the_groups_claim:_state_hypotheses,_compute_the_test_statistic_and_obtain_the_P-value._Interpret_the_P-value._Is_there_sufficient_evidence_to_conclude_that_the_civil_rights_group_is_correct?_Use_a_1%_significance_level_to_make_a_decision.

Question 1 (of 7)

 


Ho and Ha: QR Challenge

https://www.classtools.net/QR/decode.php?text=The_manufacturer_of_a_particular_brand_of_microwave_popcorn_claims_that_only_2_percent_of_its_kernels_of_corn_fail_to_pop.__A_competitor,_believing_that_the_actual_percentage_is_larger,_tests_2,000_kernels_and_finds_that_44_failed_to_pop.__Do_these_results_provide_sufficient_evidence_to_support_the_competitor’s_belief?

Question 2 (of 7)

 


Ho and Ha: QR Challenge

https://www.classtools.net/QR/decode.php?text=USA_Today_reported_that_in_1992,_39%_of_all_elementary_school_children_claimed_that_when_they_grow_up_they_want_to_do_something_to_help_other_people.__However,_in_1995,_128_of_a_random_sample_of_317_of_these_same_children_claimed_that_when_they_grow_up_they_want_to_do_something_to_help_other_people.__Does_this_information_indicate_that_there_has_been_an_attitude_change_either_way?

Question 3 (of 7)

 


Ho and Ha: QR Challenge

https://www.classtools.net/QR/decode.php?text=Back_in_the_year_2000,_a_poll_was_done_with_the_workers_at_the_Pentagon_(approximately_30,000_workers)_to_determine_what_percentage_of_the_workers_bought_lunch_in_the_cafeteria_on_a_regular_basis._The_percentage_was_18.4%._It_is_thought_that_with_a_greater_selection,_a_greater_percentage_of_people_buy_lunch_currently._It_is_too_difficult_to_ask_every_worker_so_a_random_sample_of_the_250_workers_was_used._It_was_found_that_61_people_buy_their_lunch_on_a_regular_basis.

Question 4 (of 7)

 


Ho and Ha: QR Challenge

https://www.classtools.net/QR/decode.php?text=“The_nature_of_work_is_changing_at_whirlwind_speed.__Perhaps_now_more_than_ever_before,_job_stress_poses_a_threat_to_the_health_of_workers_and,_in_turn,_to_the_health_of_organizations.”__So_says_the_National_Institute_for_Occupational_Safety_and_Health.__Employers_are_concerned_about_the_effect_of_stress_on_their_employees.__Stress_can_lower_morale_and_efficiency_and_increase_medical_costs.__A_large_survey_of_restaurant_employees_found_that_75%_reported_that_work_stress_had_a_negative_impact_on_their_personal_life.__The_human_resources_manager_of_a_chain_of_restaurants_is_concerned_that_work_stress_may_be_affecting_the_chain’s_employees.__She_asks_a_random_sample_of_100_employees_to_respond_yes_or_no_to_the_questions,_“Does_work_stress_have_a_negative_impact_on_your_personal_life?”_Of_these,_68_say_“yes.”_Is_there_evidence_to_conclude_that_the_proportion_for_this_chain_of_restaurants_differs_from_the_value_given_for_the_national_survey?_Use_the_appropriate_inference_procedure_to_support_your_answer.

Question 5 (of 7)

 


Ho and Ha: QR Challenge

https://www.classtools.net/QR/decode.php?text=“The_nature_of_work_is_changing_at_whirlwind_speed.__Perhaps_now_more_than_ever_before,_job_stress_poses_a_threat_to_the_health_of_workers_and,_in_turn,_to_the_health_of_organizations.”__So_says_the_National_Institute_for_Occupational_Safety_and_Health.__Employers_are_concerned_about_the_effect_of_stress_on_their_employees.__Stress_can_lower_morale_and_efficiency_and_increase_medical_costs.__A_large_survey_of_restaurant_employees_found_that_75%_reported_that_work_stress_had_a_negative_impact_on_their_personal_life.__The_human_resources_manager_of_a_chain_of_restaurants_is_concerned_that_work_stress_may_be_affecting_the_chain’s_employees.__She_asks_a_random_sample_of_100_employees_to_respond_yes_or_no_to_the_questions,_“Does_work_stress_have_a_negative_impact_on_your_personal_life?”_Of_these,_68_say_“yes.”_2. Construct_and_interpret_a_95%_confidence_interval_for_the_proportion_of_employees_that_say_stress_is_affecting_their_personal_life.

Question 6 (of 7)

 


Ho and Ha: QR Challenge

https://www.classtools.net/QR/decode.php?text=Larry,_a_starting_player_for_a_major_college_basketball_team,_made_only_40%_of_his_free_throws_last_season.__During_the_summer,_he_worked_on_developing_a_softer_shot_in_hopes_of_improving_his_free_throw_accuracy.__In_the_first_eight_games_of_the_season,_Larry_made_25_free_throws_in_40_attempts.__You_want_to_investigate_whether_Larry’s_work_over_the_summer_will_result_in_a_higher_proportion_of_free_throw_successes_this_season._Construct_and_interpret_a_90%_confidence_interval_for_the_proportion_of_free_throws_Larry_will_make_this_season.

Question 7 (of 7)