Adjusted R Std. Error of Model R RSquare Square the Estimate .568* 322 308 6.48743 a. Predictors: (Constant), Test 1 (%) ANOVA" Sum of Model Squares df Mean Square F Sig. Regression 960.521 1 960.521 22.822 000 Residual 2020.162 48 42.087 Total 2980.683 49 a. Dependent Variable: Course % b. Predictors: (Constant), Test 1 (%) Coefficients Standardized Unstandardized Coefficients Coeffcients Model B Std. Error Beta Sig. 1 (Constant) 55.423 6.331 8.755 .000 Test 1 (%) 370 .077 .568 4.777 000 a. Dependent Variable: Course %
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10. Consider the output below. Is Test 1 a significant predictor of Course %?
A- Yes
B- No
C- Not enough information to answer this question
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- Tiffany is a manager who needs to fire the worst performing 3% of employees. At her organization, employee performance is a normally distributed variable. Tiffany should fire employees who have a performance score that correspond with a z-score less than or equal to _____Q: An online bookseller is considering selling an e-reader but will do so only if they have evidence that the proportion of customers who will likely purchase one is more than 0.4. Of a survey of 25 customers, 8 of them stated that they would likely purchase an e-reader. What should the bookseller do? Use a 5% significance level.What is the cumulative frequency of students that scored half of the points on the SAT? choices: 1. none of the above/can't be determined 2. 26 3. 9 4. 55.5 5. 0.35 I already tried 2(26) and 5(0.35) but it was wrong.
- Describe in detail the results achieved on the company’s test. Ignore other variables for now, just describe the test results. If the company is considering training for the lowest 10% of employees what score would they need to achieve to be exempted from training? Test Result 163 148 142 173 168 155 163 194 119 124 149 171 160 104 165 154 122 160 148 138 158 112 189 163 203 165 176 152 74 129 166 134 124 169 187 163 172 195 149 107 156 183 133 83 148 127 173 95 139 179 136 153 141 155 179 152 129 155 145 113 142 147 171 139 174 143 96 199 143 172 123 146 128 187 138 163 178 154 199 164 123 201 205 135 123 138 195 184 165 196 154 176 82 173 156 149 152 116 174 141 111 74 123 182 157 141 167 162 172 107 149 182 112 135 177 159 138 163 148 198…15. ACT scores The Mathematics section of the ACT test had a mean of 20.9 and an SD of 5.3 for the years 2013-2015. If these are well modeled by a Normal distribution, about what percent of students scored a) over 31? b) under 18? c) between 18 and 31?Show the solution
- 1. The data in Table 7–6 were collected in a clinical trial to evaluate a new compound designed to improve wound healing in trauma patients. The new compound was com- pared against a placebo. After treatment for 5 days with the new compound or placebo, the extent of wound healing was measured. Is there a difference in the extent of wound healing between the treatments? (Hint: Are treatment and the percent wound healing independent?) Run the appropriate test at a 5% level of significance. Use the data in Problem 1. Pool the data across the treatments into one sample of size n = 250. Use the pooled data to test whether the distribution of the percent wound healing is approximately normal. Specifically, use the following distribution 30%, 40%, 20%, and 10% and a = 0.05 to run the appropriate test. Percent Wound Healing Treatment 0-25% 26-50% 51-75% 76-100% New compound (n=125) 15 37 32 41 Placebo (n=125) 36 45 34 10Classify the study as either descriptive or inferential. Explain your answer. Data from a sample of citizens of a certain country yielded the following estimates of average TV viewing time per month for all citizens 2 years old and older. The times are in hours and minutes; Q1 stands for first quarter. Viewing method Change (%) Q1 2011 158:41 10:16 Q1 2010 158:14 Watching TV in the home 0.3 Watching timeshifted TV 9:07 12.6 DVR playback 26:34 25:44 3.2 25:27 25:59 -2.1 Using the Internet on a computer Watching video on Internet 4:23 3:58 10.5 4:36 3:38 26.6 Mobile subscribers watching video on a mobile phone (...) Is the study descriptive or inferential? OA. The study is inferential, because the statistics are used to describe the sample. OB. The study is inferential, because the statistics are used to make an inference about the population. Time Remaining: 01:41:10 Next Statcrunch 29 of 30 Questions Left this cycle 70°F Sunny here to search O דוi.20% of the response times are longer than how many minutes? iI.Find the IQR of the response times. Suppose that another “major city” claimed that its police force response times followed a normal model with a mean of 8 minutes. What is the SD of this model if 95% of the response times were at most 12 minutes? Show all steps in your solution.
- 10.2.21 Question Help Twenty years ago, 53% of parents of children in high school felt it was a serious problem that high school students were not being taught enough math and science. A recent survey found that 284 of 800 parents of children in high school felt it was a serious problem that high school students were not being taught enough math and science. Do parents feel differently today than they did twenty years ago? Use the a = 0.1 level of significance. Click here to view the standard normal distribution table (page 1). Click here to view the standard normal distribution table (page 2). Because npo (1-Po = 199.3 > 10, the sample size is less than 5% of the population size, and the sample can be reasonably assumed to be random, the requirements for testing the hypothesis are satisfied. (Round to one decimal place as needed.). What are the null and alternative hypotheses? Но versus H,: (Type integers or decimals. Do not round.) Enter your answer in the edit fields and then click…The average number of cavities that thirty-year-old Americans have had in their lifetimes is 4. Do twenty-year-olds have a different number of cavities? The data show the results of a survey of 11 twenty- vear-olds who were asked how many cavities they have had. Assume that the distribution of the population is normal. 2, 5, 3, 2, 5, 3, 5, 2, 2, 2, 4 What can be concluded at the a = 0.05 level of significance? a. For this study, we should use Select an answer b. The null and alternative hypotheses would be: ns Ho: ? vSelect an answer v re H: ? v Select an answer c. The test statistic 2 v = (please show your answer to 3 decimal places.) urse d. The p-value = e. The p-value is ? va f. Based on this, we should Select an answer v the null hypothesis. g. Thus, the final conclusion is that... (Please show your answer to 4 decimal places.) O The data suggest that the population mean number of cavities for twenty-year-olds is not significantly different from 4 at a = 0.05, so there is…In a fishing lodge brochure, the lodge advertises that 75% of its guests catch northern pike over 20 pounds. Suppose that last summer 59 out of a random sample of 85 guests did, in fact, catch northern pike weighing over 20 pounds. Does this indicate that the population proportion of guests who catch pike over 20 pounds is different from 75% (either higher or lower)? Use a = 0.05. (a) What is the level of significance? State the null and alternate hypotheses. O Ho: p = 0.75; H1: p 0.75 (b) What sampling distribution will you use? O The Student's t, since np 5 and ng > 5. O The standard normal, since np 5 and nq > 5. What is the value of the sample test statistic? (Round your answer to two decimal places.) (c) Find the P-value of the test statistic. (Round your answer to four decimal places.)