A group of students were surveyed about the number of siblings they have. Their responses are summarized in the relative frequency table below. What is the cumulative relative frequency of students with 2 or fewer siblings?

Number of SiblingsRelative Frequency
00.20
10.32
20.16
30.12
4 or more0.20

Which of the following is one of the most common causes of collisions? a. driving on the wrong side of the road b. driving too slowly uphill c. tailgating d. eating while driving

The probability of committing a type i error is equal to which of the following? significance level, α type i error type ii error p-value alternative hypothesis

Without stratospheric ozone, which of the following would most likely occur? i. smog over major cities would be greatly reduced. ii. farms would produce surplus crops because of increased photosynthesis. iii. uv radiation would damage phytoplankton and reduce populations of aquatic consumers. i only ii only iii only i and ii i and iii