Questions from Statistics Principles

Q: Among six new apps available this month, only three will prove

Among six new apps available this month, only three will prove to be useful to you in the long run. Suppose you purchase three of the apps at random. Find the probability distribution of X, the number...

Q: Establish the connection between the large sample Z test, which rejects

Establish the connection between the large sample Z test, which rejects H0 : µ = µ0 in favor of H1 : µ ≠ µ0 , at a = .05, if and t...

Q: Using the t able for the x2 distributions, find:

Using the t able for the x2 distributions, find: (a) The upper 5% point when d.f = 8. (b) The upper 1% point when d.f = 16. (c) The lower 2.5% point when d.f. = 9. (d) The lower 1% point when d.f = 27...

Q: Name the x2 percentiles shown and find their values. /

Name the x2 percentiles shown and find their values. (c) Find the percentile in part (a) if d.f = 37. (d) Find the percentile in part (b) if d.f = 11. (e) Verify your answers above using software....

Q: Using MINITAB software to compute x2 percentiles. (a)

Using MINITAB software to compute x2 percentiles. (a) Determine x2.05 for the x2 distribution with d.f = 19. (b) Determine P (x2 ≤ 30) for d.f. = 19. Repeat Part (a) but click on Cumulative probabilit...

Q: Use software to find the probability (a) x2 ≤

Use software to find the probability (a) x2 ≤ 17.2 when d .f = 9. (b) x2 > 13.7 when d.f. = 23. (c) Find c such that P(x2 > c) = .015 when d.f = 12. ( d) Find c such that P ( x2 < c) = .04 when d....

Q: Use software to find (a) T < -1

Use software to find (a) T < -1.729 when d.f = 19. (b) |T| > 2.179 when d.f = 12. (c) -1.703 < T < 1. 703 when d.f 27. (d) -1.833 < T < 2.821 when d.f. 9.

Q: Find a 90% confidence interval for (, based on the n

Find a 90% confidence interval for (, based on the n = 40 measurements of heights of red pine seedlings. State any assumption you make about the population.

Q: Plastic sheets produced by a machine are periodically monitored for possible fluctuations

Plastic sheets produced by a machine are periodically monitored for possible fluctuations in thickness. Uncontrollable heterogeneity in the viscosity of the liquid mold makes some variation in thickne...

Q: Refer to Exercise 9.41. Construct a 95% confidence

Refer to Exercise 9.41. Construct a 95% confidence interval for the true standard deviation of the thickness of sheets produced on this shift. Data from Exercise 9.41: Plastic sheets produced by a ma...