In a preliminary study to determine whether the installation of a camera designed to catch cars that go through red lights affects the number of violators, the number of red-light runners was recorded for each day of the week before and after the camera was installed. These data are listed here. Can we infer that the camera reduces the number of red-light runners?

Concerned about graffiti, mayors from 6 suburban communities instituted a citizen community watch program. To evaluate the program, the number of graffiti incidents was recorded for the 2-month period before and after the program. Below are the results.

At the 0.025 significance level, can it be concluded that the average number of graffiti incidents declined?

TRANSPORTATION ENGINEERING: A multilane highway has four lanes (2 in each direction) and a measured FFS of 55 mph. One upgrade is 5% and 0.62 miles long. Currently trucks are not permitted on the road, but there are 2% busses in the directional volume of 1900 vehicles (PHF is 0.80). Local authorities are considering allowing trucks into the traffic stream. If this is done, they estimate 150 trucks will use this highway during peak hour. Before trucks, the driver population factor is 1, and it goes to 0.97 after trucks. What will be the level of service before and after trucks are allowed on the road.

• The following are the weekly losses of work-hours due to accidents in 10 industrial plants before and after a certain safety program were put into operation

1. Is the assumption that the difference in weekly losses of work-hours is normally distributed reasonable?
2. Test whether the safety program is effective. Use α=0.05.
3. Find a 95% confidence interval on the difference in mean weekly losses of work-hours.

A coach uses a new technique to train gymnasts. 7 gymnasts were randomly selected and their competition scores were recorded before and after the training. The results are shown below

Subject     A    B    C   D     E      F G
Before     9.6 9.7 9.7 9.4 9.7 9.5 9.5
After       9.7 9.9 9.7 9.3 9.8 9.8 9.3

Using a 0.01 level of significance, test the claim that the training technique is effective in raising the gymnasts’ score.

Use the traditional method of hypothesis testing with critical value t= -3.143.

1. A coach uses a new technique to train gymnasts. 7 gymnasts were randomly selected and their competition scores were recorded before and after the training. The results are shown below

Using a 0.01 level of significance, test the claim that the training technique is effective in raising the gymnasts’ score.

Use the traditional method of hypothesis testing with critical value t= -3.143.

Medical Microbiology Lab Report 36

DNase Test

Name__________________________________ Date _________________

Draw your plate or take photos of your plate before and after the addition of HCl.

Before      After

S. aureus E. aerogenes S. aureus E. aerogenes

Interpretation and Questions:

Which organism secreted DNase?

Why would an organism’s ability to produce this enzyme be clinically significant?

S. aureus is a common component of the biota of the skin and nasal passages. What steps should be taken by the dialysis unit described in the case file to minimize nosocomial infection in its patients?

A rock sits at the bottom of a fish tank and the level of the water in the tank is noted. The rock is then put into an old fashioned ice cube tray (made from aluminium) and is floated on the top of the water. The level is again noted. Which of the following is true?

a). The water level is the same before and after.

b). The water level is higher before when rock is at the bottom of the fish tank.

c). The water level is higher after when the rock is floating in the tray.

d). The rock cannot float in a metal ice cube tray.

e). Cannot determine without more information.

• The following are the weekly losses of work-hours due to accidents in 10 industrial plants before and after a certain safety program were put into operation

1. Is the assumption that the difference in weekly losses of work-hours is normally distributed reasonable?
2. Test whether the safety program is effective. Use α=0.05.

Find a 95% confidence interval on the difference in mean weekly losses of work-hours

You are titrating 50 ml. of nitrous acid with sodium hydroxide (0.15 M). Equivalence is reached at 22.0 ml of NaOH delivered. Calculate the pH of the solution in the flask: - before the beginning of the titration - after the delivery of 5 ml. of titrant - at half$equivalence - at equivalence -after delivery of 23 ml. of titrant. -------------Give detail Show ALL WORK, UNITS and use ICE/reaction table and ML (no millimoles). Please be clear in how you get numbers for everything like the reaction table... I've asked this before and have gotten incomplete answers.