A researcher hypothesizes a positive relationship between drivers' use of cell phones and road rage incidents. How should the null hypothesis (H₀) be stated? A) H₀: all μs are equal B) H₀: ρ = 0 C) H₀: $\mu$Cell phone = $\mu$Road rage D) H₀: $\mu$ = 0

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The null hypothesis should state that there is no relationship between drivers' use of cell phones and road rage incidents. Option B represents this, as ρ = 0 indicates that there is no correlation between the two variables. Option A is too general and does not specifically address the relationship between the variables, while options C and D are not clearly and appropriately written.

A Researcher Hypothesizes a Positive Relationship Between Drivers' Use of Cell