Blog

What happens with a thermal inversion?

What is the major problem with oil shale and tar sands?

Ozone is a considered a pollutant when it is located in the:

A researcher has calculated a 90% confidence interval for the mean weight in grams (µ) of a newborn baby and found it to be 2934 ± 222 grams. (Note that this means the the confidence interval is 2712 < µ < 3156). Determine whether the following statements is true or false. There is a 90% probability that µ is between 2934 and 3156 grams.

Explain which test you would use to analyze the data. (You may get a little partial credit if you list the variables and type of each variable.)   You want to know whether a piece of bare copper wire in a bird bath will release enough dissolved copper to kill mosquito larvae. You go to a birdwatchers’ club and find 32 people who each have two bird baths in their yard. You have them randomly choose one bird bath to put a piece of copper wire into. After a month, you go to each bird bath and count the number of mosquito larvae. Which test should you use?  

In a one-way ANOVA, when the null hypothesis that the means are all the same is rejected using the ANOVA, we can then conclude that all the means are different from one another.

A researcher has calculated a 90% confidence interval for the mean weight in grams (µ) of a newborn baby and found it to be 2934 ± 222 grams. (Note that this means the the confidence interval is 2712 < µ < 3156). Determine whether the following statements is true or false.   If we took many additional random samples of the same size and from each computed a 90% confidence interval for µ, approximately 90% of these intervals would contain µ.

Is there a significant relationship between the number of stamens and the number of carpels?  Explain (using a hypothesis test).

View the three type of dose-response curves below – the top on is (a), the middle is (b) and the last one is (c). Which graph would most likely correspond to how a test on BPA (an endocrine disruptive chemical) would look like? 

Which of the following values of r indicates the most strongest relationship between two quantitative variables?