E Homework: Section 7.2 Homework Question 9, 7.2.31-T Part 1 of 2 HW Score: 0%, 0 of 11 points O Points: 0 of 1 Save Assume that all grade-point averages are to be standardized on a scale between 0 and 4. How many grade-point averages must be obtained so that the sample mean is within 0.008 of the population mean? Assume that 1. Does the sample size seem practical? a 95% confidence level is desired. If using the range rule of thumb, o can be estimated as range 4-0 = 4 4 The required sample size is (Round up to the nearest whole number as needed.) Question 10, 7.2.33-T > Part 1 of 2 HW Score: 0%, 0 of 11 points O Points: 0 of 1 Save The ages of a group of 148 randomly selected adult females have a standard deviation of 17.3 years. Assume that the ages of female statistics students have less variation than ages of females in the general population, so let o 17.3 years for the sample size calculation. How many female statistics student ages must be obtained in order to estimate the mean age of all female statistics students? Assume that we want 95% confidence = that the sample mean is within one-half year of the population mean. Does it seem reasonable to assume that the ages of female statistics students have less variation than ages of females in the general population? E Homework: Section 7.2 Homework O The required sample size is (Round up to the nearest whole number as needed.) A The pulse rates of 170 randomly selected adult males vary from a low of 41 bpm to a high of 101 bpm. Find the minimum sample size required to estimate the mean pulse rate of adult males. Assume that we want 98% confidence that the sample mean is within 4 bpm of the population mean. Complete parts (a) through (c) below. a. Find the sample size using the range rule of thumb to estimate . n= (Round up to the nearest whole number as needed.) O Homework: Section 7.2 Homework Question 1, 7.2.2 Part 1 of 3 Refer to the accompanying data display that results from a sample of airport data speeds in Mbps. Complete parts (a) through (c) below. Click the icon to view at distribution table. HW Score: 0%, 0 of 11 points O Points: 0 of 1 a. What is the number of degrees of freedom that should be used for finding the critical value ta/2? df= (Type a whole number.) Tinterval (13.046,22.15) x= 17.598 Sx 16.01712719 n=50 Save