Inferential tests

I have been struggling with these questions for days now (see file attached). Can you please help? thanks.

Inferential Tests

Question: An analyst working at BC Statistics is compiling a report on the use of the internet at home. In 1997, 250 randomly selected people were asked about the average amount of time spent on the internet per week. The same 250 people were re-surveyed in June 2000. Which test should the analyst to determine whether the home use of the internet has increased significantly between 1997 and 2000? a. two sample t-test with directional hypotheses b. paired t-test with non-directional hypotheses c. paired t-test with directional hypotheses d. two sample Kolmogorov-Smirnov Goodness of Fit test. Could you provide me with the correct answer and also briefly explain why it is the correc... click for more

New to me, very confused

Go to http://www.weather.unisys.com/upper_air/ua_500.html to bring up the current 500mb chart for the U.S. What is the wind speed and direction at Denver on the 500 mb chart? Be sure to indicate the direction (North, Northwest, etc.) that the wind is coming FROM.

Dew point, Air temperature and Precipitation

In areas of precipitation, the dew point and air temperature are higher than in the surrounding areas not receiving rain. In areas of precipitation the dew point and air temperature are also the same or close to being the same. What can you say about the relationship between air temperature and the air's dew point for stations within areas of precipitation?

pressure changes and high pressure areas

Pressure changes on the west side of a high pressure area tend to decrease and tend to increase on the east side of a high pressure area. Explain this phenomenon?