Suppose that a standardized biology exam has a mean score of 80% correct, with a standard deviation of 1.5. the school administration believes that the new class of freshmen have a different mean exam score. a sample of 40 students from the freshmen class is used and a mean score of 83% correct is obtained. calculate a 99% confidence interval. list the lower bound (rounded to 2 decimal places):

1. there are 25 students who started computer programming in elementary school and 25 students who started computer programming in middle school. the first group had a mean final project grade of 95% and the second group had a mean final project grade of 92%. the line plot shows the differences after 10 rerandomizations. determine whether the difference in the means of the two groups is significant based on the line plot. explain your answer.

Hurry im being timed the graph of f(x)=x^3-3x^2+4 is shown based on the graph how many distinct real numbers solutions does the equation x^3-3x^2+4=0 have

Grace paid $1.70 for 5 ounces of candy. how much did she pay for 24 ounces?