Homework Answers
A z interval is a specific type of confidence interval which tells you a range where you can expect a particular mean or proportion to fall.
To get the 95% confidence interval here, we can use the Z-interval.
Option 5 is the right answer.
We wish to estimate (with 95% confidence) what percent of students take the bus to school....
We wish to estimate (with 95% confidence) what percent of students take the bus to school. We survey a random sample of 850 students and get the following results: 70 students take the bus, 770 students do not take the bus and 10 students did not respond We should use: 2-SampTInt TInterval 2-PropZInt ZInterval 1-PropZInt 2-SampZInt
18. Scores this year on the SAT mathematics test (SAT-M) for students taking the test for...
18. Scores this year on the SAT mathematics test (SAT-M) for students taking the test for the first time are believed to be Normally distributed with mean 4. For students taking the test for the second time, this year's scores are also believed to be Normally distributed but with a possibly different mean 42. We wish to estimate the difference - A random sample of the SAT-M scores of 100 students who took the test for the first time this...
Question 14 2 pt Scores of 166 students on an exam were normally distributed with the...
Question 14 2 pt Scores of 166 students on an exam were normally distributed with the mean 79 and the standard deviation of 6. Using the "68-95-99.7" rule, estimate how many students score above 91 O1 o O 8 O2 O 6 Not enough information to answ nswer the question None of the given numerical values is correct
3. We have testified 10 students who joined the summer library program and got their reading comprehension score, mean...
3. We have testified 10 students who joined the summer library program and got their reading comprehension score, mean = 145, and standard deviation is 2.5. What is the confidence interval of 95%? (2 points)
Question 17 The mean of a distribution is 20 and the standard deviation is 2. At...
Question 17 The mean of a distribution is 20 and the standard deviation is 2. At least what percentage of the values will fall between 10 and 30? Do not round the percentage. Blank 1 % Question 18 The exam scores of 20 students were recorded as follows: 73, 87, 62, 98, 43, 90, 88, 97, 100, 87, 95, 100, 56, 78, 100, 88, 70, 78, 63, 78 Find the MODE. If there is no mode, type No Mode. If...
Question 17 (1 point) Let's say that i take our class to be a SRS and...
Question 17 (1 point) Let's say that i take our class to be a SRS and gather data on everyone's weight. Taking that sample we see that our sample mean is 68 kilograms. Assume that we magically know that the true population standard deviation is 10 kilograms. Based on our data, gathered from 40 students, can you give me an estimate on the true population mean weight? Give me a 95% Confidence interval O (64.9,71.1) (66.4, 69.92) (62, 74.2) (58.1,...
Research question: In the population of all American adults, how strong is the relationship between age...
Research question: In the population of all American adults, how strong is the relationship between age and reaction time? Data were collected from a representative sample of 500 American adults concerning their ages (in years) and reaction times (in milliseconds). What procedure should be used to estimate the strength of this relationship in the population? CI for single mean CI for single proportion CI for difference in means CI for difference in proportions CI for correlation 2Research question: To what...
Question 18 3 pts Small Sample Mean Problem. Each year the Heritage Foundation creates an Index...
Question 18 3 pts Small Sample Mean Problem. Each year the Heritage Foundation creates an Index of Economic Freedom for countries around the word based on assessments of freedom on property rights, corruption, business freedom, and labor freedom, among many others. We have a sample of 31 countries taken from the 2016 data. The following is a summary of this sample. Economic Freedom STEM Leaf 4* 64 509 18 22 24 32 42 5*60 65 74 75 76 77 91...
Question 1. Thirty graduate students were asked how many credit hours they were taking in the...
Question 1. Thirty graduate students were asked how many credit hours they were taking in the current quarter. Download the available data: Calculate the mean, median, standard deviation, variance, and range for this sample using Excel. Write a sentence explaining what each measure means. What is the standard error of the mean based on the data? What would be the best point estimate for the population credit hours? (“Population” refers to all graduate students’ credit hours in the universe.) What...
please answer all question 16-20 Question 16 2 pts The population mean for a standardized test...
please answer all question 16-20
Question 16 2 pts The population mean for a standardized test is 250. A research study with N = 30 adults from Virginia had a mean score of 260, with a 95% confidence interval of the mean reported as [248, 272]. What decision should be made based on this confidence interval? o Run the hypothesis test again o Accept the research hypothesis o Reject the null hypothesis o Fail to reject the null hypothesis Question...
18. Scores this year on the SAT mathematics test (SAT-M) for students taking the test for the first time are believed to be Normally distributed with mean 4. For students taking the test for the second time, this year's scores are also believed to be Normally distributed but with a possibly different mean 42. We wish to estimate the difference - A random sample of the SAT-M scores of 100 students who took the test for the first time this...
Question 14 2 pt Scores of 166 students on an exam were normally distributed with the mean 79 and the standard deviation of 6. Using the "68-95-99.7" rule, estimate how many students score above 91 O1 o O 8 O2 O 6 Not enough information to answ nswer the question None of the given numerical values is correct
3. We have testified 10 students who joined the summer library program and got their reading comprehension score, mean = 145, and standard deviation is 2.5. What is the confidence interval of 95%? (2 points)
Question 17 (1 point) Let's say that i take our class to be a SRS and gather data on everyone's weight. Taking that sample we see that our sample mean is 68 kilograms. Assume that we magically know that the true population standard deviation is 10 kilograms. Based on our data, gathered from 40 students, can you give me an estimate on the true population mean weight? Give me a 95% Confidence interval O (64.9,71.1) (66.4, 69.92) (62, 74.2) (58.1,...
Question 18 3 pts Small Sample Mean Problem. Each year the Heritage Foundation creates an Index of Economic Freedom for countries around the word based on assessments of freedom on property rights, corruption, business freedom, and labor freedom, among many others. We have a sample of 31 countries taken from the 2016 data. The following is a summary of this sample. Economic Freedom STEM Leaf 4* 64 509 18 22 24 32 42 5*60 65 74 75 76 77 91...
please answer all question 16-20
Question 16 2 pts The population mean for a standardized test is 250. A research study with N = 30 adults from Virginia had a mean score of 260, with a 95% confidence interval of the mean reported as [248, 272]. What decision should be made based on this confidence interval? o Run the hypothesis test again o Accept the research hypothesis o Reject the null hypothesis o Fail to reject the null hypothesis Question...
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