Homework Answers
An outlier is a value that is very different from the other data in data set. They skew study results. they increase error variance and limit the power of statistical tests. In non random distribution, they can decrease normality, increasing the risk of making both Type I and Type II errors. Third, they can seriously bias or influence predictions that may be of utmost interest.
the impact of outlier in small dataset will be more as compared to large dataset as a single extreme value in small dataset will cause inflation of standard deviation to a great extent. Whereas in large dataset., impact of outlier is not that strong.
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Why is it important for researchers to eliminate significant outliers from their data before running a...
1. The variance in a production process is an important measure of the quality of the...
1. The variance in a production process is an important measure of the quality of the process. A large variance often signals an opportunity for improvement in the process by finding ways to reduce the process variance. The following sample data show the weight of bags (in pounds) produced on two machines: machine 1 and 2. m1 = (2.95, 3.45, 3.50, 3.75, 3.48, 3.26, 3.33, 3.20, 3.16, 3.20, 3.22, 3.38, 3.90, 3.36, 3.25, 3.28, 3.20, 3.22, 2.98, 3.45, 3.70, 3.34,...
please tell me if its a z test ke t test and why it is :)...
please tell me if its a z test ke t test and why it is :)
thanks!
CHECK ANSWERS! You should use a Z test because of the large sample size 30 < and we know the mean and the standard deviation. 6. The Graded Naming Test (GNT) requires respondents to name objects in a set of 30 black-and-white drawings. The test is often used to detect brain damage in the UK. The test begins with easy words like kangaroo,...
Researchers studied the effects of learning about the effectiveness of a new medication (Tal & Wansink,...
Researchers studied the effects of learning about the effectiveness of a new medication (Tal & Wansink, 2014). Some participants heard information about the medication; others heard the same information and saw a graph that depicted the data they had heard about. Thus, the two groups had identical information. Participants rated the effectiveness of the medication on a scale of 1-9, with 9 indicating a higher level of effectiveness. The researchers reported "Participants given graphs expressed greater belief in the claims,...
FROM DATA TO DECISION Critical Thinking: What does the survey tell us? Surveys have become an integral pa is so important that every citizen have the ability to interpret survey results, surveys...
FROM DATA TO DECISION Critical Thinking: What does the survey tell us? Surveys have become an integral pa is so important that every citizen have the ability to interpret survey results, surveys are the focus of this project. rt of our lives. Because it The Pew Research Center recently conducted a survey of 1007 U.S. adults and found that 85% of those surveyed know what Twitter is Analyzing the Data 3. Explain why it would or would not be okay...
In Problem 6 you found a confidence interval for the difference from previously gathered data. In...
In Problem 6 you found a confidence interval for the difference from previously gathered data. In this problem you want to set the sample size for the two groups before conducting the study This will often be the case for clinical data where you want to make sure that, if a particular difference in two groups of the amount or level of a substance exists, your test will come back saying that such a difference exists. In other words, you...
When they send out their fundraising letter, a philanthropic organization typically gets a return from about...
When they send out their fundraising letter, a philanthropic organization typically gets a return from about 5% of the people on their maling list To see what the response rate might be in the future, they did a simulation using samples of size 20, 50, 100, and 200. For each sample size, they simulated 1000 mailings with success rate p 0.05 and constructed the histogram of the 1000 sample proportions, as shown in the accompanying table. Explain how these histograms...
Please assist with 6.52 Whats Wrong questions!!! Please explain why, if possible. Thank you!!! SECTION 6.2...
Please assist with 6.52 Whats Wrong questions!!! Please
explain why, if possible. Thank you!!!
SECTION 6.2 SUMMARY e A test of significance i A test of significance is intended to assess the evidence provide against a null hypothesis Ho in favor of an alternative hypothesis Ha . The hypotheses are stated in terms of population is a statement that no effect or no difference is present, and Ha says there is an effect or difference in a specific direction (one-sided...
12. Provide an appropriate response. Samples of size n- 240 are randomly selected from the population...
12. Provide an appropriate response. Samples of size n- 240 are randomly selected from the population of numbers (0 through 20) produced by a random-number generator, and the variance is found for each sample. What is the distribution of the sample variances? O normal (approximately) O skewed to the right O skewed to the left O not enough information provided 13. Choose the correct response. ( point) Why is sampling without replacement acceptable with a large population? When a small...
Researchers wanted to determine if the psychological profile of healthy children was different than for children...
Researchers wanted to determine if the psychological profile of healthy children was different than for children suffering from recurrent abdominal pain? (RAP) or recurring headaches. A total of 210 children and adolescents were studied and their psychological profiles were graded according to a child behavior checklist. Children were stratified in two age? groups: 4 to 11 years and 12 to 18 years. The results of the study are summarized in the accompanying table. Complete parts ?(a) through? (f) below. n...
2.) The data below are from an independent-measures experiment comparing the effects of insomnia treatments. Treatment...
2.) The data below are from an independent-measures experiment comparing the effects of insomnia treatments. Treatment 1 is a control group, Treatment 2 meditated before sleeping, and Treatment 3 received a sleeping pill. Note Pay close attention to what information you are given! Treatment1 Treatment 2 Treatment 3 6 G-36 T2 = 8 SS2 -6 T's = 24 SS-6 SS: = 6 a.Complete the ANOVA summary table below to help determine whether these data indicate any significant mean differences among...
please tell me if its a z test ke t test and why it is :)
thanks!
CHECK ANSWERS! You should use a Z test because of the large sample size 30 < and we know the mean and the standard deviation. 6. The Graded Naming Test (GNT) requires respondents to name objects in a set of 30 black-and-white drawings. The test is often used to detect brain damage in the UK. The test begins with easy words like kangaroo,...
Researchers studied the effects of learning about the effectiveness of a new medication (Tal & Wansink, 2014). Some participants heard information about the medication; others heard the same information and saw a graph that depicted the data they had heard about. Thus, the two groups had identical information. Participants rated the effectiveness of the medication on a scale of 1-9, with 9 indicating a higher level of effectiveness. The researchers reported "Participants given graphs expressed greater belief in the claims,...
FROM DATA TO DECISION Critical Thinking: What does the survey tell us? Surveys have become an integral pa is so important that every citizen have the ability to interpret survey results, surveys are the focus of this project. rt of our lives. Because it The Pew Research Center recently conducted a survey of 1007 U.S. adults and found that 85% of those surveyed know what Twitter is Analyzing the Data 3. Explain why it would or would not be okay...
In Problem 6 you found a confidence interval for the difference from previously gathered data. In this problem you want to set the sample size for the two groups before conducting the study This will often be the case for clinical data where you want to make sure that, if a particular difference in two groups of the amount or level of a substance exists, your test will come back saying that such a difference exists. In other words, you...
When they send out their fundraising letter, a philanthropic organization typically gets a return from about 5% of the people on their maling list To see what the response rate might be in the future, they did a simulation using samples of size 20, 50, 100, and 200. For each sample size, they simulated 1000 mailings with success rate p 0.05 and constructed the histogram of the 1000 sample proportions, as shown in the accompanying table. Explain how these histograms...
Please assist with 6.52 Whats Wrong questions!!! Please
explain why, if possible. Thank you!!!
SECTION 6.2 SUMMARY e A test of significance i A test of significance is intended to assess the evidence provide against a null hypothesis Ho in favor of an alternative hypothesis Ha . The hypotheses are stated in terms of population is a statement that no effect or no difference is present, and Ha says there is an effect or difference in a specific direction (one-sided...
12. Provide an appropriate response. Samples of size n- 240 are randomly selected from the population of numbers (0 through 20) produced by a random-number generator, and the variance is found for each sample. What is the distribution of the sample variances? O normal (approximately) O skewed to the right O skewed to the left O not enough information provided 13. Choose the correct response. ( point) Why is sampling without replacement acceptable with a large population? When a small...
2.) The data below are from an independent-measures experiment comparing the effects of insomnia treatments. Treatment 1 is a control group, Treatment 2 meditated before sleeping, and Treatment 3 received a sleeping pill. Note Pay close attention to what information you are given! Treatment1 Treatment 2 Treatment 3 6 G-36 T2 = 8 SS2 -6 T's = 24 SS-6 SS: = 6 a.Complete the ANOVA summary table below to help determine whether these data indicate any significant mean differences among...
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