A statistics professor sample mean score for an exam is 80 with a population standard deviation of 7 points from a sample of n=30. Calculate a 95% confidence interval for the population mean. O (77.38, 82.61) (77.83, 82.16) (77.49, 82.5) (77.89, 82.1)
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- Help is neededDetermine the margin of error for the confidence interval for the mean: 23 +1.7 The margin of error isA test of reading skills is administered to 12th grade students. The distribution of scores is normal with mean 288 and standard deviation 38. Using the 68-95-99.7 rule, fill in the blanks in the statement below: 95% of reading scores will be between (blank) and (blank)
- Cereals sodium values have a mean of 167 and a standard deviation of 77.3. Find the z-score for the cereal that has a sodium value of 0. How would you interpret this z-score?Watching TV: The 2012 general Social Survey asked a large number of people how much time they spent watching TV each day. The mean number of hours was 3.09 with a standard deviation of 2.9. Assume that in a sample of 37 teenagers, the sample standard deviation of daily TV time is 2.2 hours, and that the population of TV watching times is normally distributed. Can you conclude that the population standard deviation of TV watching times for teenagers differs from 2.9? Use the a=0.10 level of significance.In a t-test for paired samples, the one value that compares, for each person, her or his two measurements is called the . Difference score Deviation score Standard deviation Standard difference
- Consider a value to be significantly low if its z score less than or equal to - 2 or consider a value to be significantly high if its z score is greater than or equal to 2. A data set lists weights (grams) of a type of coin. Those weights have a mean of 5.62152 g and a standard deviation of 0.05197 g. Identify the weights that are significantly low or significantly high. What weights are significantly low? Select the correct answer below and fill in the answer box(es) to complete your choice. O A. Weights that are greater than . (Round to five decimal places as needed.) (Round to five decimal places as needed.) B. Weights that are less than C. Weights that are between and. (Round to five decimal places as needed. Use ascending order.)The highway mileage (in mpg) for a sample of 6 different models of a car company can be found below. Find the mean and standard deviation. Round to one decimal place as needed. 20, 22, 26, 27, 30, 31 Mean= Enter an integer or decimal number [more..] Standard Deviation = We are interested in converting the first car's highway mileage to a z score. This z score O is measured in mpg squared. O is measured in mpg O is measured in the square root of mpg. O has no unit of measurement. Submit Question E C R 5 T MacBook Air Y 8 N K M *Daily Driving The average number of miles a person drives per day is 24. A researcher wishes to see if people over age 60 drive less than 24 miles per day. She selects a random sample of 25 drivers over the age of 60 and finds that the mean number of miles driven is 23.4. The population standard deviation is 4.1 miles. At a = 0.01, is there sufficient evidence that those drivers over 60 years old drive less than 24 miles per day on average? Assume that the variable is normally distributed. Use the critical value method with tables. Part: 0 / 5 Part 1 of 5 State the hypotheses and identify the claim with the correct hypothesis. Ho: (Choose one) OUse the normal distribution of heights of adult women, which has a mean of 167 centimeters and a standard deviation of 8 centimeters, and the following table with the standard scores and percentiles for a normal distribution to find the indicated quantity. The percentage of heights less than 179 centimeters is ___%Find 90% confidence interval4000 B.C. A.D. 150 A study was done on skull sizes of humans during different time periods. The results are shown in the table. Assume that the two samples are independent simple random samples selected from normally distributed populations, and do not assume that the population standard deviations are equal. Complete parts (a) and (b) below. H2 27 27 131.05 mm 133.94 mm S 5.18 mm 5.27 mm a. Use a 0.05 significance level to test the claim that the mean skull breadth in 4000 B.C is less than the mean skull breadth in A.D 150. What are the null and alternative hypotheses? O B. Ho: H1 =H2 O A. Ho: H1 =H2 H:H1> H2 OC. Ho: H1 = H2 H1: H1 # H2 O D. Ho: H1 # H2 H: H1SEE MORE QUESTIONSRecommended textbooks for youMATLAB: An Introduction with ApplicationsStatisticsISBN:9781119256830Author:Amos GilatPublisher:John Wiley & Sons Inc
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