Katrina Bell, analyst for the Hexaco Oil Company, has been assigned the task of investigating the claim that Hexaco dealers charge more for unleaded gasoline than do independent dealers. Katrina is afraid that if she chooses two independent random samples of stations for each type of dealer, the variability in price due to geographic location might be a factor. To eliminate this source of variability, she chooses a pair of stations : one independent and one Hexaco in close geographic proximity of each region. The results of the sampling are in Sheet 47. What should Katrina conclude at the 0.01 significance level? Hexaco Independent 90,5 89,9 91,9 90,9 92,7 90,9 91,9 90,9 93,6 91,8 89,9 90,9 90,9 90,9 89,8 88,9 88,7 88,9 87,9 88,6 92,7 91,9 Select one: a. p-value = 0.04, reject H0, Hexaco dealers charge more than independent dealers b. t stat = 1.96, t critical = 1.81, reject H0, Hexaco dealers charge more than independent dealers c. t stat = 1.96, t critical = 2.76, fail to reject H0, not enough evidence to support the claim that Hexaco dealers charge more d. t stat = 0.85, t critical = 2.53, fail to reject H0, not enough evidence to support the claim that Hexaco dealers charge more
Addition Rule of Probability
It simply refers to the likelihood of an event taking place whenever the occurrence of an event is uncertain. The probability of a single event can be calculated by dividing the number of successful trials of that event by the total number of trials.
Expected Value
When a large number of trials are performed for any random variable ‘X’, the predicted result is most likely the mean of all the outcomes for the random variable and it is known as expected value also known as expectation. The expected value, also known as the expectation, is denoted by: E(X).
Probability Distributions
Understanding probability is necessary to know the probability distributions. In statistics, probability is how the uncertainty of an event is measured. This event can be anything. The most common examples include tossing a coin, rolling a die, or choosing a card. Each of these events has multiple possibilities. Every such possibility is measured with the help of probability. To be more precise, the probability is used for calculating the occurrence of events that may or may not happen. Probability does not give sure results. Unless the probability of any event is 1, the different outcomes may or may not happen in real life, regardless of how less or how more their probability is.
Basic Probability
The simple definition of probability it is a chance of the occurrence of an event. It is defined in numerical form and the probability value is between 0 to 1. The probability value 0 indicates that there is no chance of that event occurring and the probability value 1 indicates that the event will occur. Sum of the probability value must be 1. The probability value is never a negative number. If it happens, then recheck the calculation.
Katrina Bell, analyst for the Hexaco Oil Company, has been assigned the task of investigating the claim that Hexaco dealers charge more for unleaded gasoline than do independent dealers. Katrina is afraid that if she chooses two independent random samples of stations for each type of dealer, the variability in price due to geographic location might be a factor. To eliminate this source of variability, she chooses a pair of stations : one independent and one Hexaco in close geographic proximity of each region. The results of the sampling are in Sheet 47. What should Katrina conclude at the 0.01 significance level?
Hexaco Independent
90,5 89,9
91,9 90,9
92,7 90,9
91,9 90,9
93,6 91,8
89,9 90,9
90,9 90,9
89,8 88,9
88,7 88,9
87,9 88,6
92,7 91,9
Step by step
Solved in 4 steps
