Researchers are concerned about the impact of students working while they are enrolled in classes, and they’d like to know

if students work too much and therefore are spending less time on

their classes than they should be. First, the researchers need to find

out, on average, how many hours a week students are working They know from previous studies that the standard deviation of this

variable is about 5 hours.

(i) A survey of 200 students provides a sample mean of 7.10

hours worked. 95% confidence interval based on this sample is

6.41 to 7.79.

Do you agreed with the researcher that the 95% confident interval of

the unknown population mean of the students worked hours lies

between 6.41 and 7.79?

Indicate whether the researchers are right or wrong, giving reasons

for your answer.

(ii) Based on your understanding of confident interval estimation;

explain the reason why the researcher did not use 100% confidence

level, but instead he used 95% confidence level.

(iii) The researchers are not satisfied with their confidence interval

and want to do another study to find a shorter confidence interval.

What should they change to ensure they find a shorter confidence interval?

note: the given question is incomplete.

complete question is given below.

which is an example of kinetic energy?

a. the energy stored in ethanol  

b. a hockey puck sliding across the ice  

c. a compressed spring  

d. a ball sitting at the top of a ramp

solution: the kinetic energy is the energy posses by the virtue of the motion of the object.

in the given options, a, c and d are the example of potential energy because it is the energy posses by the virtue of the rest of the object. but option b has the kinetic energy as the object is in motion.

hence, a hockey puck sliding across the ice   is the apex example of kinetic energy.

so, the option (b) a hockey puck sliding across the ice   is the correct option.

the following is queen elizabeth’s purposes:

- to encourage the parliament that the technique of picking successors to the seat based merely on birthright needs to be reviewed.

- (not) to convince the parliament that her kid should not be measured as a likely choice for heir to the english power.

- to persuade the parliament that merely since she has a child does not assure that the kid will be a capable leader.

- to sway the parliament how shattering it could be if they proceeded discourteously concerning her or her child.

in order to follow the instructions and complete the statements, i need to use data from table c of your student guide. can you think of a way to let me see your student guide for a while ? i can't answer the question without the data in table c.