15. A student asks, "If the mean income of 10 people is \( \$ 10,000 \) and one person gets a raise of \( \$ 10,000 \), is the median, the mean, or the mode changed and, if so, by how much?" 16. Jose asks, "Why can a median number of children not be 3.8 " How do you respond? 17. Suppose the class takes a test and the following averages are obtained: mean, 80 ; median, 90 ; and mode, 70 . Tom, who scored 80 , would like to know if he did better than half the class. What is your response? 18. A student asks if it is possible to find the mode for data in a grouped frequency table. What is your response? 19. A student asks if she can draw any conclusions about a set of data if she knows that the mean for the data is less than the median. How do you answer? 21. Mel's mean on 10 tests for the quarter was 89 . She complained to the teacher that she should be given an A because she missed the cutoff of 90 by only a single point. Explain whether it is clear that she really missed an A by only a single point if each test was based on 100 points.

Suponga que está evaluando la precisión de un pronóstico de demanda de productos en una fábrica. El pronóstico inicial y los datos reales son los siguientes: Pronóstico: \( [100,150,200,250] \) Datos reales: \( [90,160,210,240] \). ¿Cuál es la desviación absoluta media DAM de este pronóstico?

Question 6 of 7 , Step 2 of 3 It currently takes users a mean of 22 minut made to the program, the company execut simple random sample of 91 new custome deviation of 5.5 minutes. Perform a hypoth Step 2 of 3 : Compute the value of the test Answer

Determine the point estimate of the population mean and margin of error for the confidence interval. Lower bound is 20 , upper bound is 30 . The point estimate of the population mean is

simple random sample of size \( n \) is drawn from a population that is normally distributed. The sample mean, \( \overline{\mathrm{x}} \), is found to be 105 , and the sample standard deviation, \( s \), is found to be 10 . Construct a \( 95 \% \) confidence interval about \( \mu \) if the sample size, \( n \), is 20 . Construct a \( 95 \% \) confidence interval about \( \mu \) if the sample size, \( n \), is 16 . How does decreasing the sample size affect the margin of error, E? ) Construct an \( 80 \% \) confidence interval about \( \mu \) if the sample size, \( n \), is 20 . Compare the results to those obtained in part (a). How does decreasing the level of confidence affect the size of the margin d) Could we have computed the confidence intervals in parts (a)-(c) if the population had not been normally distributed? Lower bound: \( \square \); Upper bound: (Use ascending order. Round to one decimal place as needed.)

Determine the point estimate of the population mean and margin of error for the confidence interval. Lower bound is 16, upper bound is 28 . The point estimate of the population mean is