Needed ! will give 28

the two-way table shows the number of students in a school who bring their lunch and/or who ride the bus:

bring lunch do not bring lunch total
ride bus 40 35 75

do not ride bus 55 2 57

total 95 37 132

how many more bring lunch than ride the bus?
25
20
7
3

At wind speeds above 1000 centimeters per second (cm/sec), significant sand-moving events begin to occur. wind speeds below 1000 cm/sec deposit sand and wind speeds above 1000 cm/sec move sand to new locations. the cyclic nature of wind and moving sand determines the shape and location of large dunes. at a test site, the prevailing direction of the wind did not change noticeably. however, the velocity did change. fifty-nine wind speed readings gave an average velocity of x = 1075 cm/sec. based on long-term experience, σ can be assumed to be 245 cm/sec. (a) find a 95% confidence interval for the population mean wind speed at this site. (round your answers to the nearest whole number.) lower limit cm/sec upper limit cm/sec