Is it more conservative to use an alpha level of .01 or an alpha level of .05? Would beta be higher for an alpha of .05 or for an alpha of .01?
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Is it more conservative to use an alpha level of .01 or an alpha level of .05? Would beta be higher for an alpha of .05 or for an alpha of .01?
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- Sal knows that parties of people on average spend 75 minutes at their restaurant. They wonder if this average is significantly different on the weekends. They found the average time spent by the 30 parties which dined there this weekend was 82 minutes with a SD of 17 minutes. Assume an alpha of .05. What is the test statistic?If you chose the α level of .01, then which of the following p value will allow you to conclude that your result is statistically significant? a. 0.005 b. 0.05 c. 0.10 d. 0.03Bo is buying some nails for a project. They are interested in whether the boxes are significantly lower than advertised. The company says the box of nails should weigh 10 lbs but Bo finds the average weight of 8 boxes id 9.8 lbs with a SD of .4 lbs. assume alpha of .10. What is the test statistic?
- According to a report from the United States Environmental Protection Agency, burning one gallon of gasoline typically emits about 8.9 kg of CO2. A fuel company wants to test a new type of gasoline designed to have lower CO2 emissions. Here are their hypotheses: Ho: = 8.9 kg Ha:H< 8.9 kg (where u is the mean amount of CO2 emitted by burning one gallon of this new gasoline). Under which of the following conditions would the company commit a Type I error?When performing the Levene’s test of homogeneity what do we want when using an alpha level of .05?Find the value of “z sub alpha” z0.15 And for z0.02
- would the z score for the .30 be .6480?What is the difference between an observational study and an experiment? Choose the correct answer below. OA. In an experiment, a treatment is applied to part of a population and responses are observed. In an observational study, a researcher measures characteristics of interest of a part of a population but does not change existing conditions. OB. In an experiment, a treatment is applied to an entire population and responses are observed. In an observational study, a researcher measures. characteristics of interest of an entire population but does not change existing conditions. OC. In an experiment, a researcher measures characteristics of interest of a part of a population but does not change existing conditions. In an observational study, a treatment is applied to part of a population and responses are observed. OD. In an experiment, a researcher measures characteristics of interest of an entire population but does not change existing conditions. In an observational study, a…If α = .05, is this difference statistically significant?
- The average American man weighs 197.9 pounds; this can be treated as the population mean. I want to assess whether or not American men at a southwestern college weigh significantly different from the average weight. Test this hypothesis at an alpha of 0.05. The average American man weighs 197.9 pounds; this can be treated as the population mean. I want to assess whether or not American men at a southwestern college weigh significantly different from the average weight. Test this hypothesis at an alpha of 0.05. null hypothesis: H0: μ= 197.9 alternative hypothesis: H1: μ ≠ 197.9 Data: 178, 189, 198, 205, 210, 204, 189, 183, 190, 200, 166, 189, 174, 145, 160 degrees of freedom: N-1 , 15-1, 14 What is the critical t value (t table)? ________ What is the obtained t value? ____________ What can you conclude?A researcher wishes to determine whether there is a difference in the average age of elementary school, high school, and community college teachers. Teachers are randomly selected from each group. Their ages are recorded below. Test the claim that at least one mean is different from the others. Use α = 0.01.2. Two manufacturing companies of soap each claims that their product is superior in whitening one's complexion. A researcher did an experiment by randomly choosing two groups and assigning each group to use the product for one month. Results are shown below where the higher the number, the more effective the product in skin whitening. At 0.01 (t-tabular value is +2.88) level, is there a significant difference between the two products effectiveness in skin whitening? Product (Soap A or B) A 10 12 13 13 15 15 15 17 18 24 25 25 25 27 28 30 30 | 8 9 11 15 16 16 16 19 20 21 25 25 26 28 29 30 30 32 33 33 LO04