A random sample of pharmacy customers showed the waiting times below ( in minutes).  17 18 16 20 20 12 19 19 15 27 14 23 15 25 18 20 Find a 90 percent confidence interval for u, assuming that the sample is from a normal population. Round your standard devatiation answer to 4 decimal places and t-value to 3 decimal places. Round your answers to 3 decimal places.

The table contains pulse rates collected from males, who are non-smokers but do drink alcohol. The before pulse rate is before they exercised, and the after pulse rate was taken after the subject ran in place for one minute. Compute a 90% confidence interval for the mean difference in pulse rates from before and after exercise. Round to two decimal places. Pulse Rate of Males Before and After Exercise Pulse before 49 89 51 51 73 75 74 65 50 66 53 89 58 87 52 49 85 68 60 Pulse after 94 141 81 91 157 125 106 79 66 156 89 130 101 134 130 72 112 123 97 % confidence, it can be said that the mean difference in pulse rates from % and With before and after exercise is between %.

At what age do infants speak their first word of English? Here are 20 data of children (age in month) 15 26 10 9 15 20 18 11 8 20 7 9 10 11 11 10 12 17 11 10 whAt is 99% confidence interval for the mean age at which children speak first words? Upper limit? lower limit?

→ 2. A consumer watchdog organization received customer complaints about the performance of one brand of batteries. To investigate, the researcher purchased 24 of these batteries and ran them until they died. This sample lasted a mean of 47 hours with a standard deviation of 3 hours. a. What assumption must we make about battery life in order to use a t model? #3 # 3 b. Find a 95% confidence interval for the mean lifespan of this brand of batteries. c. Write a conclusion based on your confidence interval. $ 4 % 5 < 6 6 DELL & 7 O 8 9 ) 0 Р