Loading
by BlastRoom
Checking the conditions and finding the probability that a sample mean falls in a range.
#probability_and_statistics
20 questions
One question set, multiple game modes. Tap any game to see it in action. Not sure which to pick?
Answer to place stones and capture territory.
Outrun the snow together.
Earn blasts, then hunt the other team.
Answer to earn energy, then climb.
The class blasts through walls together.
Bid on mystery lots. Most money wins.
Sell tours. Nice, standard, or a total scam.
Answer, restock, and serve the rush.
More correct answers pulls the rope your way.
Answer, then shoot down the alien wave.
Answer, then tap to leap the frozen ridge.
A dairy fills bottles with population mean mu = 750 mL and sigma = 18 mL. Random samples of 9 bottles are taken and x-bar is recorded. What are the mean and standard deviation of the sampling distribution of x-bar?
Rechargeable batteries have population mean mu = 10.0 hours and sigma = 1.6 hours. A lab records x-bar for random samples of 16 batteries. What are the center and standard deviation of the sampling distribution of x-bar?
A cereal line fills boxes with population mean mu = 500 g and sigma = 30 g. Random samples of 25 boxes are weighed, and x-bar is recorded. What are the mean and standard deviation of the sampling distribution of x-bar?
Medical tablets have population mean thickness mu = 3.2 mm and sigma = 0.20 mm. Random samples of 4 tablets are measured. What are the mean and standard deviation of the sampling distribution of x-bar?
Train commute times have population mean mu = 42 min and sigma = 12 min. Random samples of 36 trips are taken, and x-bar is recorded. What are the mean and standard deviation of the sampling distribution of x-bar?
At a clinic, patient wait times have mu = 18 min and sigma = 6 min. For random samples of 9 patients, the sampling distribution of x-bar has standard deviation 2 min. If x-bar = 21 min, what is its z-score?
A juice filler has mu = 355 mL and sigma = 8 mL. For random samples of 16 bottles, x-bar has standard deviation 2 mL. If one sample has x-bar = 351 mL, what is the z-score?
In a district, algebra exam scores have mu = 72 points and sigma = 10 points. For random samples of 25 students, x-bar has standard deviation 2 points. A sample has x-bar = 75. What z-score corresponds to this sample mean?
Greenhouse plant heights have mu = 40 cm and sigma = 12 cm. For random samples of 36 plants, x-bar has standard deviation 2 cm. If a sample has x-bar = 37 cm, what is the z-score?
A bakery's roll masses have mu = 100 g and sigma = 15 g. For random samples of 25 rolls, x-bar has standard deviation 3 g. To four decimals, what is P(x-bar is greater than 106 g)?
Reaction times have mu = 500 ms and sigma = 40 ms. The curve is the sampling distribution of x-bar for samples of 16 (SD 10 ms). The red lines mark 485 ms and 515 ms. To four decimals, what is the probability that x-bar is in the shaded region?
Bottles of water from a filler have mu = 2.50 L and sigma = 0.20 L. For random samples of 16 bottles, x-bar has standard deviation 0.05 L. To four decimals, what is P(x-bar is less than 2.42 L)?
Bean plants in a greenhouse have mu = 64 cm and sigma = 12 cm. For random samples of 36 plants, x-bar has standard deviation 2 cm. To four decimals, what is P(x-bar is between 62 cm and 68 cm)?
Bus trip times have mu = 80 min and sigma = 20 min. The curve is the sampling distribution of x-bar for samples of 25 trips (SD 4 min). The red line marks 72 min. To four decimals, what is the probability that x-bar is in the shaded region?
Vitamin tablets from a factory have mu = 120 mg and sigma = 30 mg. For random samples of 9 tablets, x-bar has standard deviation 10 mg. To four decimals, what is P(x-bar is between 110 mg and 130 mg)?
Incubator temperatures have mu = 38.0 °C and sigma = 4.0 °C. For random samples of 64 readings, x-bar has standard deviation 0.5 °C. To four decimals, what is P(x-bar is less than 37.0 °C)?
The histogram shows a farm's population of egg masses, with mu = 62 g and sigma = 5 g. A random sample of 8 eggs is used to compute x-bar. Is a normal model for x-bar defensible, and why?
The histogram shows the population of clinic bill amounts, with mu = $80 and sigma = $60. A random sample of 12 bills is used to compute x-bar. Is a normal model for x-bar defensible, and why?
The histogram shows the population of bolt lengths from a factory, with mu = 50 mm and sigma = 3 mm. A random sample of 64 bolts is used to compute x-bar. Is a normal model for x-bar defensible, and why?
The histogram shows the population of delivery package masses, with mu = 4.0 kg and sigma = 6.0 kg. A random sample of 20 packages is used to compute x-bar. Is a normal model for x-bar defensible, and why?
Crack the passcode before the zombies get in.
Answer, then swat bugs for bonus points.
Race through questions at your own speed.
Same question on every screen. Fastest wins.
Pick a tile, answer, hit bonuses and steals.
Margin of Error: What Changes It
40 questions
