4.A botanist is studying the petal lengths,measured in milli

4.A botanist is studying the petal lengths,measured in millimeters,of two species of lilies.The boxplots above illustrate the distribution of petal lengths from two samples of equal size,one from species A and the other from species B.Based on the boxplots,which of the following is a correct conclusion about the data collected in this study?
(A) The inter-quartile ranges are the same for both samples.
(B) The range for species B is greater than the range for species A.
(C) There are more petal lengths that are greater than 70mm for species A than there are for species B.
(D) There are more petal lengths that are greater than 40mm for species B than there are for species A.
(E) There are more petal lengths that are less than 30mm for species B than there are for species A.
---------------------------
5.A delivery service places packages into large containers before flying them across the country.These filled containers vary greatly in their weight.Suppose the delivery service’s airplanes always transport two such containers on each flight.The two containers are chosen so their combined weight is close to,but does not exceed,a specified weight limit.A random sample of flights with these containers is taken,and the weight of each of the two containers on each selected flight is recorded.The weights of the two containers on the same flight
(A) will have a correlation of 0
(B) will have a negative correlation
(C) will have a positive correlation that is less than 1
(D) will have a correlation of 1
(E) cannot be determined from the information given
--------------------------
6.A wildlife biologist is interested in the relationship between the number of chirps per minute for crickets (y) and temperature.Based on the collected data,the least squares regression line is ,where x is the number of degrees Fahrenheit by which the temperature exceeds 50 degrees.Which of the following best describes the meaning of the slope of the least squares regression line?
(A) For each increase in temperature of 1 degree Fahrenheit,the estimated number of chirps per minute increases by 10.53.
(B) For each increase in temperature of 1 degree Fahrenheit,the estimated number of chirps per minute increases by 3.41.
(C) For each increase of one chirp per minute,there is an estimated increase in temperature of 10.53 degrees Fahrenheit.
(D) for each increase of one chirp per minute,there is an estimated increase in temperature of 3.41 degrees Fahrenheit.
(E) The slope has no meaning because the units of measure for x and y are not the same.
-----------------------------
只需答出每题考查的知识点和正确选项