QUESTION 181 POINT

Suppose a chef claims that her meatball weight is less than4ounces, on average. Several of her customers do not believe her, so the chef decides to do a hypothesis test, at a10%significance level, to persuade them. She cooks14meatballs. The mean weight of the sample meatballs is3.7ounces. The chef knows from experience that the standard deviation for her meatball weight is0.5ounces.

• H0:4;Ha:<4
• =0.1(significance level)

What is the test statistic (z-score) of this one-mean hypothesis test, rounded to two decimal places?

Provide your answer below:

Test statistic =

QUESTION 191 POINT

Given the plot of normal distributionsAandBbelow, which of the following statements is true? Select all correct answers.

The first curve, labeled A, enters the bottom left of the viewing window, just above the horizontal axis, goes up to the right gradually, reaches a high point, then goes down to the right and exits the bottom right of the viewing window, well above the horizontal axis. The second curve, labeled B, enters the bottom left of the viewing window, between the horizontal axis and the first curve, goes up to the right rapidly, intersects the first curve, reaches a high point above and to the left of the high point of the first curve, then goes down to the right symmetrically, intersects the first curve, and exits the bottom right of the viewing window, just above the horizontal axis.

Select all that apply:

Ahas the larger mean.

Bhas the larger mean.

The means ofAandBare equal.

Ahas the larger standard deviation.

Bhas the larger standard deviation.

The standard deviations ofAandBare equal.

QUESTION 201 POINT

Kenneth, a competitor in cup stacking, claims that his average stacking time is8.2seconds. During a practice session, Kenneth has a sample stacking time mean of7.8seconds based on11trials. At the4%significance level, does the data provide sufficient evidence to conclude that Kenneth's mean stacking time is less than8.2seconds? Accept or reject the hypothesis given the sample data below.

• H0:=8.2seconds;Ha:<8.2seconds
• =0.04(significance level)
• z0=1.75
• p=0.0401

Select the correct answer below:

Do not reject the null hypothesis because thep-value0.0401is greater than the significance level=0.04.

Reject the null hypothesis because thep-value0.0401is greater than the significance level=0.04.

Reject the null hypothesis because the value ofzis negative.

Reject the null hypothesis because|1.75|>0.04.

Do not reject the null hypothesis because|1.75|>0.04.

QUESTION 211 POINT

What is thep-value of aright-tailedone-mean hypothesis test, with a test statistic ofz0=1.74? (Do not round your answer; compute your answer using a value from the table below.)z1.51.61.71.81.90.000.9330.9450.9550.9640.9710.010.9340.9460.9560.9650.9720.020.9360.9470.9570.9660.9730.030.9370.9480.9580.9660.9730.040.9380.9490.9590.9670.9740.050.9390.9510.9600.9680.9740.060.9410.9520.9610.9690.9750.070.9420.9530.9620.9690.9760.080.9430.9540.9620.9700.9760.090.9440.9540.9630.9710.977

Provide your answer below:

QUESTION 221 POINT

Becky's statistics teacher was teaching the class how to perform thez-test for a proportion. Becky was bored because she had already mastered the test, so she decided to see if the coin she had in her pocketwould come up heads or tails in a truly random fashion when flipped. She discretely flipped the coin30times and got heads18times.

Becky conducts a one-proportionhypothesis testat the5%significance level, to test whether the true proportion of heads is different from50%.

Which answer choice shows the correct null and alternative hypotheses for this test?

Select the correct answer below:

H0:p=0.6;Ha:p>0.6, which is a right-tailed test.

H0:p=0.5;Ha:p<0.5, which is a left-tailed test.

H0:p=0.6;Ha:p0.6, which is a two-tailed test.

H0:p=0.5;Ha:p0.5, which is a two-tailed test.

QUESTION 231 POINT

A medical researcher claims that the proportion of people taking a certain medication that develop serious side effects is 12%. To test this claim, a random sample of 900 people taking the medication is taken and it is determined that 93 people have experienced serious side effects. .

The following is the setup for this hypothesis test:

H0:p= 0.12

Ha:p0.12

Find the p-value for this hypothesis test for a proportion and round your answer to 3 decimal places.

The following table can be utilized which provides areas under the Standard Normal Curve:

z	0.00	0.01	0.02	0.03	0.04	0.05	0.06	0.07	0.08	0.09
-1.8	0.036	0.035	0.034	0.034	0.033	0.032	0.031	0.031	0.030	0.029
-1.7	0.045	0.044	0.043	0.042	0.041	0.040	0.039	0.038	0.038	0.037
-1.6	0.055	0.054	0.053	0.052	0.051	0.049	0.048	0.047	0.046	0.046
-1.5	0.067	0.066	0.064	0.063	0.062	0.061	0.059	0.058	0.057	0.056
-1.4	0.081	0.079	0.078	0.076	0.075	0.074	0.072	0.071	0.069	0.068

Provide your answer below:

P-value=

QUESTION 241 POINT

A statistics professor recently graded final exams for students in her introductory statistics course. In a review of her grading, she found the mean scoreout of100points was ax=77, with a margin of error of10.

Construct a confidence interval for the mean score (out of100points) on the final exam.

Provide your answer below:

(, )

QUESTION 251 POINT

Karen is studying the relationship between the time spent exercisingper day and the time spent outside per day and has collected the data shown in the table. The line of best fit for the data isy^=0.16x+45.5. Assume the line of best fit is significant and there is a strong linear relationship between the variables.

Exercising(Minutes)7090110130TimeSpentOutside(Minutes)57606267

According to the line of best fit, what would be the predicted number of minutes spent outside for someone who spent58minutes exercising?Round your answer to two decimal places, as needed.

Provide your answer below:

The predicted number of minutes spent outside is