Answer:
Choice B
Step-by-step explanation:
The information given falls under the nominal scale of measurement since classifications can be made into distinct groups. For instance, students might be sorted into categories based on their eye colors. Even numerical codes can be used within the nominal scale for grouping; for example, assigning numbers 1, 2, and 3 for students with brown, black, and green eyes, respectively. However, these numbers do not hold any numerical weight. Therefore, data from a nominal scale may be numeric or non-numeric.
The expression that represents the balance (b) in relation to the number of years (t) is given as
... b = 2000·2^(t/19)...... the amount increases exponentially and is doubled when t=19
Consequently, when t=5, the balance is
... b = 2000·2^(5/19) ≈ 2400
The correct answer is...
... A. $2400
The correct response is D; we can treat the survey as one involving a single variable, responding with either "yes, I attended more than 4 games" or "no." Given the random survey of 10 students meets the randomization criterion and that their responses are independent, options B and C can be dismissed. However, since only 10 students were surveyed, the confidence interval will not be narrow. As per Statistical Solutions, a minimum of 10 subjects per variable is essential for regression analysis. If the query concerns the number of games each student attended, the potential variables increase; conversely, if it solely asks, “Did you attend more than 4 games?”, then we only consider a single variable, making 10 students sufficient.
The solution is found in the image attached below.
A) To establish a sampling plan, follow these 5 steps:
1) Identify the sample population: which customers will you reach out to?
Those who purchased a new car during a specific year.
2) Determine the population size: how many customers will you contact?
From the 30,000 car buyers, select 1,000 customers to contact.
3) Select contact method: what is your means of contacting customers?
Since you have a list with names and addresses, mailing questionnaires is feasible.
4) Define the sampling frame: what is the timeline or deadline for contacting customers?
Send out questionnaires and allow two months for responses.
5) Decide on the analysis approach: is your research qualitative or quantitative?
You aim for quantitative research, so you will use probabilistic sampling.
B) The 32.5% probability relates only to those customers who experienced mechanical issues, specifically power door lock problems, and does not account for those without any problems or those reporting issues after the first 5,000 miles.
C) To estimate the probability of power door lock problems among all customers within the first 5,000 miles, consider the entire sample:
P = 13 / 1000 = 0.013
Therefore,
N = 0.013 × 30,000 = 390
Thus, the estimated number of new cars that had power door lock issues within 5,000 miles is 390.
