Blog

Use this set-up for Problems 48-51: As of April 5, 2021, the average cost of a wedding in Missouri was determined to be $20,058 (according to valuepenguin.com). Suppose the population standard deviation of wedding costs is $7,500. To determine if the average cost of a wedding in Illinois is more than Missouri, you decide to take a sample of 36 weddings and perform a hypothesis test. Suppose your simple random sample had an average cost of $22,333. You decide to use a significance level of 0.05.What hypotheses would be used to determine if the average cost of a wedding in Illinois is more than the average in Missouri?

Use this set-up for Problems 53-56: A Quinnipiac poll performed on January 28-February 1, 2021 asked Americans, “Are you willing to get a COVID-19 vaccine, or not?” 30% of respondents said they were not. You wonder whether this proportion has changed in the past few months, so you conduct a poll of 100 Americans and ask the same question. 25 people in your sample were unwilling to get the COVID-19 vaccine. Suppose you set . What hypotheses should you set-up to determine if the percentage has changed since the initial poll?

Find the angle between the given vectors. Round to the nearest tenth of a degree.u = i – j, v = 5i + 6j

Identify each given point of the function as a local maximum, local minimum, or saddle point. (-5, -4) [minmaxsaddle1]   (-5, 4) [minmaxsaddle2]   (5, -4) [minmaxsaddle3]   (5, 4) [minmaxsaddle4]  

Find the length of the curve with the given vector equation.r(t) = 3ti + j + k; -9≤ t ≤ -6

Evaluate the line integral along the curve C.ds, C is the curve r(t) = (9 sin t)i + (9 cos t)j + 5tk, 2 ≤ t ≤ 4

Use the probability distribution from number 13 for this problem. Suppose you roll this weighted die twice. The outcomes of a 4 on the first roll and a 6 on the second roll are considered:

Write the equation for the plane.The plane through the points P(-1, 7, -44) , Q(2, -3, 20) and R(1, -1, 4). 

Find the triple scalar product (u x v) ∙ w of the given vectors.u = -5i – 3j + 4k; v = 6i – 2j + 3k; w = 9i – 3j – 6k

Solve the problem.A 150-lb sign is hanging from the end of a hinged boom, supported by a cable inclined at 36° with the horizontal. Find the tension in the cable and the compression in the boom rounded to the nearest pound.