1) Problem #PRAKBZK "PRAKBZK - 269771 - The following dat..." |
A)
The following dataset is an example of: © STATS4STEM.ORG |
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B)
The following is an example of exponential growth: Determine A. Round answer to the nearest hundredth. |
2) Problem #PRAJBJT "PRAJBJT - 31-1-B" |
What month has the least variablity? State the number or the month in the answer. © STATS4STEM.ORG |
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3) Problem #PRAJBPQ "PRAJBPQ - 239674 - Suppose that Kraf..." |
Suppose that Kraft’s bags of shredded cheddar cheese are normally distributed with μ = 24 ounces and σ =3 ounces. If Kraft wants to change the standard deviation so that 5% of the bags weigh less than 20 ounces, what would the new standard deviation become? Round answer to the nearest hundreth. Link to z-table. © STATS4STEM.ORG |
4) Problem #PRAJ9XA "PRAJ9XA - 267778 - Using the compute..." |
A)
Using the computer output for linear regression found below, what percentage of variability in y can be explained by the linear model where x is the explanatory variable? Round percentage to the nearest whole number. © STATS4STEM.ORG |
B)
For linear regression, degrees of freedom equals: |
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C)
Calculate the margin of error needed to construct a 99% confidence interval for the true slope of the least-squares regression line. Round answer to the nearest hundredth. Link to t-table. |
5) Problem #PRAJBUZ "PRAJBUZ - Baseball" |
In order for a baseball to pass inspection it must weigh 5 ounces. There is a 2% chance that any one ball fails inspection. If 127 balls were sent for inspection, what is the probability that at least 1 will fail inspection? Round answer to the nearest hundredths. © STATS4STEM.ORG |
6) Problem #PRAJBX2 "PRAJBX2 - 239932 - &n..." |
A)
The above figure is a density curve that represents the distribution of random variable X. What is the height of the density curve? Round answer to the nearest hundredth. © STATS4STEM.ORG |
B)
What is the probability that X is between 7.8 and 8.6? Round answer to the nearest hundredth. |
C)
What is the probability that X=7.4? Round answer to the nearest hundredth. |
D)
What is the probability that X is between 8.5 and 8.9 ? Round answer to the nearest hundredth. |
E)
What is the probability that X is between 8.2 and 9.2? Round answer to the nearest hundredth |
7) Problem #PRAJBZS "PRAJBZS - 239986 - You flip a fair c..." |
You flip a fair coin 25 times. What is the probability of getting exactly 14 tails? Round answer to the nearest hundredth. © STATS4STEM.ORG |
8) Problem #PRAE8Z7 "PRAE8Z7 - 147743 - Which statement i..." |
Which statement is correct? © STATS4STEM.ORG |
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9) Problem #PRAE82A "PRAE82A - 147746 - Which statement i..." |
Which statement is correct? © STATS4STEM.ORG |
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10) Problem #PRAH9TA "PRAH9TA - 237863 - Hypothesis Test - 1 Sample Mean - EJS" |
A)
Bottles of a particular brand of water is supposed to have 300 milliliters (mL) of nutrients. The amount varies from bottle to bottle because the precision of the machines is not too precise. The distribution is normal with a standard deviation σ = 3 mL. An inspector of the company suspects that the company is under-filling the bottles. The inspector took a sample of six bottles and the results are below in an effort to confirm his suspicion. 299.4, 297.7, 301, 298.9, 300.2, 297 What is the mean of this sample data set? Round answer to the nearest hundredths. © STATS4STEM.ORG |
B)
When conducting a hypothesis test, what is the first thing that we should assume? |
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C)
For this problem, what would be considered the alternative hypothesis? A) Ha: μ < 299.03 B) Ha: μ > 299.03 C) Ha: μ < 300 D) Ha: μ > 300 E) Ha: x-bar < 300 F) Ha: x-bar > 300 G) Ha: x-bar < 299.03 H) Ha: x-bar > 299.03 |
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D)
For this problem, what would be considered the null hypothesis? A) H0: μ = 299.03 B) H0: μ > 299.03 C) H0: x-bar = 300 D) H0: x-bar > 300 E) H0: μ = 300 F) H0: μ > 300 G) H0: x-bar = 299.03 H) H0: x-bar > 299.03 |
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E)
For this hypothesis test, the null and alternative hypothesis are: H0: μ = 300 Ha: μ < 300 If we assume that the null is true, what is the mean of the sampling distribution for x-bar? |
F)
If we assume that the null is true, what is the standard deviation of the sampling distribution for x-bar? Round answer to the nearest hundredth. |
H)
If the level of significance is 0.05, the most appropriate conclusion would be: |
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11) Problem #PRAKKG7 "PRAKKG7 - 276982 - For problems that..." |
For problems that pertain to proportions one can say: © STATS4STEM.ORG |
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12) Problem #PRAKFE9 "PRAKFE9 - 273078 - Which of the foll..." |
Which of the following are resistant? Check all that apply. © STATS4STEM.ORG |
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13) Problem #PRAJT8D "PRAJT8D - Harry - Coffee - CI" |
A)
Harry Potter decides to use his fame to start a coffee business called Magical Coffee. His first brand of coffee was called Magic Potion #9. But sales were slow, so he decided to brew up a new type of coffee. He decided to call his new brand of coffee Siriously Black. However, he wasn't sure if his new coffee was actually better than his old coffee. So, he decided to run a blind taste test by choosing 12 coffee drinkers to try the two types of coffee and rate both coffees on a scale of 1-10. To randomize the experiment, half the drinkers were asked to drink Magic Potion #9 first, followed by Siriously Black. The other half were asked to drink Siriously Black first, followed by Magic Potion #9. Based on the data below, calculate a 90% confidence interval to estimate the mean impovement in the Siriously Black coffee over the Magic Potion. Which of the following formulas should be used to calculate the confidence interval? A. B. C. D. E. © STATS4STEM.ORG |
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B)
Calculate the lower number of the interval. Round answer to the nearest hundredth. Link to t-table. |
C)
Calculate the upper number of the interval. Round answer to the nearest hundredth.
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14) Problem #PRAJVGP "PRAJVGP - 255824 - The following den..." |
The following density curves represent different chi-square density curves for various degrees of freedom (df). True or False: As the degrees of freedom increase for the chi-square distribution, one needs a greater and greater chi-square test statistic to reject the null. © STATS4STEM.ORG |
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