KA new reading program may reduce the number of elementaryschool students who read below grade level. The company thatdeveloped this program supplied materials and teacher trainingfor a large-scale test involving nearly 8,400 children in severaldifferent school districts. Statistical analysis of the resultsshowed that the percentage of students who did not meet thegrade-level goal was reduced from 14.7% to 14%. Thehypothesis that the new reading program produced noimprovement was rejected with a P-value of 0.026. Completeparts a) and b) below.proportion of 14.7% (or more) of students failing the testby natural sampling variation if 14% is the truepopulation value.OC. There is only a 2.6% chance of seeing a sampleproportion of 14% (or less) of students failing the test bynatural sampling variation if 14.7% is the truepopulation value.D. There is only a 97.4% chance of seeing a sampleproportion of 14% (or less) of students failing the test bynatural sampling variation if 14.7% is the truepopulation value.b) Even though this reading program has been shown to besignificantly better, why might you not recommend that your localschool adopt it?A. Under the old methods, 1,176 students would beexpected to fail. With the new program, 1,235 failed.The school would not want to adopt a new readingprogram that increases the number of students who fail.B. You might not recommend that your school adopt thenew program because the sample was not chosen atrandom, thus compromising the results.OC. You might not recommend that your school adopt thenew program because the sample size of the test wasnot large enough to come to a decision.D. Under the old methods, 1,235 students would beexpected to fail. With the new program, 1,176 failed.This is only a decrease of 59 students. It would dependon the costs of switching to the new program. A new reading program may reduce the number of elementaryschool students who read below grade level. The company thatdeveloped this program supplied materials and teacher trainingfor a large-scale test involving nearly 8,400 children in severaldifferent school districts. Statistical analysis of the resultsshowed that the percentage of students who did not meet thegrade-level goal was reduced from 14.7% to 14%. Thehypothesis that the new reading program produced noimprovement was rejected with a P-value of 0.026. Completeparts a) and b) below.a) Explain what the P-value means in this context. Choose thecorrect answer below.OA. There is a 97.4% chance of seeing a sample proportionof 14.7% (or more) of students failing the test by naturalsampling variation if 14% is the true population value.B. There is only a 2.6% chance of seeing a sampleproportion of 14.7% (or more) of students failing the testby natural sampling variation if 14% is the truepopulation value.OC. There is only a 2.6% chance of seeing a sampleproportion of 14% (or less) of students failing the test bynatural sampling variation if 14.7% is the truepopulation value.D. There is only a 97.4% chance of seeing a sampleproportion of 14% (or less) of students failing the test bynatural sampling variation if 14.7% is the truepopulation value.b) Even though this reading program has been shown to besignificantly better, why might you not recommend that your localschool adopt it?OA. Under the old methods, 1,176 students would beexpected to fail. With the new program, 1,235 failed.The school would not want to adopt a new readingprogram that increases the number of students who fail.B. You might not recommend that your school adopt thenew program because the sample was not chosen atrandom, thus compromising the results.

Given Information: Sample size n=8400 The percentage of students who did not meet the grade-level…

Answered: A new reading program may reduce the…

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018

18th Edition

ISBN:9780079039897

Author:Carter

Publisher:Carter

Chapter10: Statistics

Section10.3: Measures Of Spread

Problem 1GP

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a consumer product magazine recently ran a story concerning the increasing prices of digital cameras. the story stated that digital camera prices dipped a couple of years ago, but are now beginning to increase in price because of added features. according to the story, the average price of all digital cameras a couple of years ago was $215.00. a random sample of cameras was recently taken and entered into a spreadsheet. it was desired to test to determine if that average price of all digital cameras is now more than $215.00. what null and alternative hypothesis should be tested?
A consumer product magazine recently ran a story concerning the increasing prices of digital cameras. The story stated that digital camera prices dipped a couple of years ago, but now are beginning to increase in price because of added features. According to the story, the average price of all digital cameras a couple of years ago was $215.00. A random sample of cameras was recently taken and entered into a spreadsheet. It was desired to test to determine if that average price of all digital cameras is now more than 20) $215.00. The information was entered into a spreadsheet and the following printout was obtained: One-Sample T Test Null Hypothesis: µ = 215 Alternative Hyp: µ > 215 95% Conf Interval Variable Mean SE Lower Upper DF P. Camera Price 245.23 15.620 212.740 277.720 1.94 21 0.0333 Cases Included 22 Is a sample size n = 22 large enough to utilize the central limit theorem in this inferenti procedure? A) Yes, since the central limit theorem works whenever means are used B) No,…
Significant again? A new reading program may reducethe number of elementary school students who readbelow grade level. The company that developed thisprogram supplied materials and teacher training for alarge-scale test involving nearly 8500 children in severaldifferent school districts. Statistical analysis of the resultsshowed that the percentage of students who did not meetthe grade-level goal was reduced from 15.9% to 15.1%.The hypothesis that the new reading program producedno improvement was rejected with a P-value of 0.023.a) Explain what the P-value means in this context.b) Even though this reading method has been shown tobe significantly better, why might you not recommendthat your local school adopt it?
A consumer product magazine recently ran a story concerning the increasing prices of digital cameras. The story stated that digital camera prices dipped a couple of years ago, but now are beginning to increase in price because of added features. According to the story, the average price of all digital cameras a couple of years ago was $215.00. A random sample of n = 22 cameras was récently taken and entered into a spreadsheet. It was desired to test to determine if that average price of all digital cameras is now more than $215.00. Find a rejection region appropriate for this test if we are using a = 0.05. !! O Reject Ho ift> 2.080 or t -2080 O Reject Ho if t> 1.717 O Reject Ho if t > 1.721 O Reject Ho ift> 1.725
A consumer product magazine recently ran a story concerning the increasing prices of digital cameras. The story stated that digital camera prices dipped a couple of years ago, but now are beginning to increase in price because of added features. According to the story, the average price of all digital cameras a couple of years ago was $215.00. A random sample of n = 22 cameras was recently taken and entered into a spreadsheet. It was desired to test to determine if that average price of all digital cameras is now more than $215.00. Find a rejection region appropriate for this test if we are using α = 0.05.
An auto-parts store offers a fuel additive that claims to increase a vehicle’s gas mileage. The additive is poured into a vehicle’s gasoline tank after the tank is filled. To measure the claim, two methods to collect data are proposed.
The Excel file Room Inspection provides data for 100 room inspections at 25 hotels in a major chain. Management would like the proportion of nonconforming rooms to be less than 2%. Test an appropriate hypothesis to determine if management can make this claim.
San Gabriel office of statistics believes that the minimum salary of workers in the city is about $120,000. Some students at PCC believe this claim may be incorrect and surveyed some residents of the city. The results are provided below. At a level of significance of 2%, can we conclude that workers at San Gabriel make $120,000 annually? Please show all steps in Excel yearly Income 140,000 200000 65000 70,000 130,000 475,000 80,000 45,000 120,000 10,000 40,000 85,000
Joan's Nursery specializes in custom-designed landscaping for residential areas. The estimated labor cost associated with a particular landscaping proposal is based on the number of plantings of trees, shrubs, and so on to be used for the project. For cost estimating purposes, managers use hours of labor time for the planting of a medium-sized tree. Actual times from a sample of plantings during the past month follow (times in hours). With a level of significance, test to see whether the mean tree-planting time differs from hours.
During the 1990s, the fatality rate for lung cancer was 80 per 100,000 people. After the turn of the century and the establishment of newer treatments and adjustment in public health advertising, a random sample of 10,000 people exhibits only six deaths due to lung cancer. Test at the 0.05 significance level whether that data are proof of a reduced fatality rate for lung cancer. b. Make the decision rule. (Negative amount should be indicated by a minus sign. Round your answer to 2 decimal places.) c. Evaluate the test statistic. (Negative amount should be indicated by a minus sign. Round your answer to 3 decimal places.)
Only need the last question. Please put anwsers in bold thank you! A researcher with the Department of Education followed a cohort of students who graduated from high school in a certain year, monitoring the progress the students made toward completing a bachelor's degree. One aspect of his research was to determine whether students who first attended community college took longer to attain abachelor's degree than those who immediately attended and remained at a 4-year institution.
A researcher conducts a study to investigate whether the obesity rate rural communities differ from the obesity rate from the population at large. He gathered a sample of adults from a small community, measured their weight, and compared it to the population average. What statistical test is appropriate for this study and why?

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