Consider the data set 34 45 27 33 38 41 45 29 30 39 34 40 28 33 36 (a) What is the sample median? (b) Construct a 99% two-sided confidence interval for the population mean.
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- 8A doctor claims that the mean number of hours of sleep that seniors in high school get per night differs from the mean number of hours of sleep college seniors get per night. To investigate, he selects a random sample of 50 high school seniors from all high schools in his county. He also selects a random sample of 50 seniors from the colleges in his county. He constructs a 95% confidence interval for the true mean difference in the number of hours of sleep for seniors in high school and seniors in college. The resulting interval is (0.57, 1.25). Based upon the interval, can the doctor conclude that mean number of hours of sleep that seniors in high school get per night differs from the mean number of hours of sleep college seniors get per night? yes because 1 is in the confidence interval yes because 0 is not in the confidence interval no because 1 is in the confidence interval no because 0 is not in the confidence intervalA second-semester junior at a large high school wants to estimate the number of colleges a senior applies to on average before deciding where they will attend. The junior randomly selects 19 seniors and asks them how many colleges they applied to and records the number. Use the data below to construct a 99% confidence interval to estimate the true mean number of colleges seniors at this school apply to before deciding about which college to attend. 1, 1, 2, 2, 2, 3, 3, 3, 4, 4, 4, 5, 5, 5, 6, 7, 7, 8, 9 3. Do. Use technology to find the mean and standard deviation of the sample. Round each answer to 2 decimal places. Use those values and t* from the table to calculate the confidence interval. Round the endpoints to 1 decimal place. 99% confidence interval is (, )
- A sales analyst wants to determine whether there is a difference in the mean monthly sales of a company's four sales regions. Several salespersons from each region are randomly selected and they provide their sales amount (in thousands of dollars) for the previous month. Using a 5% significance, can we conclude at least one region is different on average? Region Sales North North North North East East East East East South South South South West West West West West 21 36 33 28 28 35 31 35 39 12 22 7 27 23 30 27 31 39 What is the factor variable? [Select an answer What is the response variable? [Select an answer Test Statistic: P-Value: Decision Rule: Select an answer Did Something Significant Happen? Select an answer There Select an answer to conclude Select an answerThe data represents a sample of the number of home fires started by fault electricalwiring for the past eight years: 20, 16, 27, 19, 18, 23, 24, and 25. Find the 90%confidence interval for the mean number of home fires started by faulty electricalwiring each yearConstruct a 95% confidence interval for mean education. Construct a 95% confidence interval for mean experience ID Ed Exp Female Salary 19 17 43 0 65.0 20 11 43 0 48.7 25 15 42 1 58.0 30 14 40 1 49.9 34 15 39 1 54.0 42 10 39 0 40.9 46 11 36 0 45.2 52 10 34 0 41.6 59 12 34 0 45.4 69 13 34 1 48.8 74 13 33 0 48.4 82 14 31 0 49.8 87 12 31 0 45.1 92 14 30 0 45.3 99 18 28 1 53.7 105 11 28 0 40.5 107 17 26 1 54.9 110 15 26 0 49.8 115 17 25 0 54.4 117 11 25 0 38.9 121 10 25 0 37.2 130 17 24 0 54.1 139 16 23 0 51.1 140 16 23 1 49.1 141 16 23 0 51.0 149 10 21 1 31.7 156 16 20 0 49.6 164 11 19 0 36.3 168 15 19 0 46.3 173 17 16 1 48.7 182 10 13 1 27.7 191 16 13 0 46.1 194 18 12 0 50.4 199 11 12 0 33.2 208 15 11 1 38.3 217 15 9 0 41.3 226 13 9 0 36.4 234 14 9 0 38.9 239 13 6 1 34.4 240 12 5 0 32.2 246 12 3 1 26.8 249 11 3 1 24.0 258 14 3 1 32.2 267 15 2 1 34.8 270 13 2 0 33.2 277 12 2 0 30.4 286 10 1 1…
- Given this data: {4, 5, 8, 11, 16, 8},(a) Find the 90% confidence interval for the mean.(b) Interpret what does the interval mean?The weights (in pounds (lb)) of 52 randomly selected NFL football players are presented below. 305 265 287 285 290 235 300 230 195 236 244 194 190 307 218 315 265 210 194 216 255 300 315 190 185 183 313 246 212 201 308 270 241 242 306 237 315 215 200 295 187 204 257 185 255 318 230 316 200 324 245 185 We would like to construct a 90% confidence interval for the mean weight of NFL football players. Explain why it is not necessary to assess normality for this sample Write an interpretation for your confidence interval, including units if appropriate. You may round the upper and lower limits to the nearest whole number. Does the confidence interval estimate the mean weight for the sample of 52 NFL players or for the population of NFL players? Explain.39. Create a 95% confidence interval for the data set below. 49 62 54 64 55 49 48 52 65 53 62 ( , ) [three decimal accuracy] [three decimal accuracy]
- A survey was conducted where 27 students were asked which social media app is their favorite, Twitter or Tiktok. male female twitter 4 4 TikTok 4 15 create and interpret (in context) a one-proportion confidence interval. You may choose the level of confidence. conduct a Chi-Squared test for Association to determine if your data provide statistically significant evidence of an association between your two variables.4. At private college the achievement test is used for advanced study placement. Counselors selected a random sample of 144 students from the college and scored their tests by hand before sending them in for computer processing. For this sample, the mean was 450 and s = 29. Construct a 98% confidence interval for the mean.24. Job Interviews In a Harris poll of 514 human resource professionals, 90% said that the appearance of a job applicant is most important for a good first impression. a. Among the 514 human resource professionals who were surveyed, how many of them said that the appearance of a job applicant is most important for a good first impression? b. Construct a 99% confidence interval estimate of the proportion of all human resource professionals believing that the appearance of a job applicant is most important for a good first impression. c. Repeat part (b) using a confidence level of 80%. d. Compare the confidence intervals from parts (b) and (c) and identify the interval that is wider. Why is it wider?