question 19&20

A researcher is interested in examining the difference in the average egg incubation temperature of two bird species in North Carolina, the Carolina chickadee versus the Carolina wren. To investigate this, she takes two random samples from both of the bird populations and calculates the average egg incubation temperature, standard deviation, and sample size for each of the two samples. The average incubation temperature for the 25 sampled Carolina chickadees is 84.9 degrees Fahrenheit, with a sample standard deviation of 15.6 degrees Fahrenheit. The average incubation temperature the 22 samples Carolina wrens is 80.5 degrees Fahrenheit, with a sample standard deviation of 17.3 degrees Fahrenheit. She has also determined that the two samples do not exhibit strong skewness and appear approximately normal. Which of the following accurately describes the parameters of interest? (01) p1: the proportion of eggs incubated by the Carolina chickadees p2: the proportion of eggs incubated by the Carolina wrens (02) a1 : the number of eggs incubated by the Carolina chickadees a2: the number of eggs incubated by the Carolina wrens 03) M1 : the average egg incubation temperature of the Carolina chickadees M2: the average egg incubation temperature of the Carolina wrens (04)Y 1: the sample average egg incubation temperature of the Carolina chickadees Y2: the sample average egg incubation temperature of the Carolina wrens Select one: Oa. (01) Ob. (02) O c. (03) O d. (04) What distribution would we use to determine the critical value of a 95% confidence interval using her sample data? Select one: O a. T-distribution with 46 degrees of freedom O b. T-distribution with 25 degrees of freedom O c. T-distribution with 21 degrees of freedom O d. Standard normal distribution