The Student's t distribution table gives critical
values for the Student's t distribution. Use an
appropriate d.f. as the row header. For a
right-tailed test, the column header is the value of
α found in the one-tail area row. For a
left-tailed test, the column header is the value of
α found in the one-tail area row, but you must
change the sign of the critical value t to −t.
For a two-tailed test, the column header is the value of
α from the two-tail area row. The critical values
are the ±t values shown.
Let x be a random variable that represents the pH of
arterial plasma (i.e., acidity of the blood). For healthy adults,
the mean of the x distribution is μ = 7.4†. A new
drug for arthritis has been developed. However, it is thought that
this drug may change blood pH. A random sample of 36 patients with
arthritis took the drug for 3 months. Blood tests showed that
x = 8.0 with sample standard deviation s = 1.7.
Use a 5% level of significance to test the claim that the drug has
changed (either way) the mean pH level of the blood. Solve the
problem using the critical region method of testing (i.e.,
traditional method). (Round your answers to three decimal
places.)
test statistic | = | |
critical value | = ± |
Ans:
Test statistic:
t=(8-7.4)/(1.7/sqrt(36))
t=2.118
df=36-1=35
critical t value=tinv(0.05,35)=+/-2.030
Decision rule:Reject H0,if t<-2.030 or t>2.030
As,test statistic lies in rejection region,we reject H0.
The Student's t distribution table gives critical values for the Student's t distribution. Use an appropriate...
The Student's t distribution table gives critical values for the Student's t distribution. Use an appropriate d.f. as the row header. For a right-tailed test, the column header is the value of α found in the one-tail area row. For a left-tailed test, the column header is the value of α found in the one-tail area row, but you must change the sign of the critical value t to −t. For a two-tailed test, the column header is the value...
The Student's t distribution table gives critical values for the Student's t distribution. Use an appropriate d.f. as the row header. For a right-tailed test, the column header is the value of α found in the one-tail area row. For a left-tailed test, the column header is the value of α found in the one-tail area row, but you must change the sign of the critical value t to −t. For a two-tailed test, the column header is the value...
Use Critical Values for the Student's t Distribution Table to find the critical value or values for the following values of the significance level a, sample size n, and alternate hypothesis H. Part: 0 / 4 Part 1 of 4 When a 0.01, n = 11, and H:> HO
Use Critical Values for the Student's t Distribution Table to find the critical value or values for the following values of the significance level a, sample size n, and alternate hypothesis H. Part 1 of 4 When a=0.01, n=11, and H: > Ho- t = 2.764 Part: 1/4 Part 2 of 4 When a = 0.025, n = 10, and H: <HO =
Let x be a random variable that represents the pH of arterial plasma (i.e., acidity of the blood). For healthy adults, the mean of the x distribution is μ = 7.4.† A new drug for arthritis has been developed. However, it is thought that this drug may change blood pH. A random sample of 36 patients with arthritis took the drug for 3 months. Blood tests showed that x = 8.7 with sample standard deviation s = 3.4. Use a...
Let x be a random variable that represents the pH of arterial plasma (i.e., acidity of the blood). For healthy adults, the mean of the x distribution is μ = 7.4.† A new drug for arthritis has been developed. However, it is thought that this drug may change blood pH. A random sample of 31 patients with arthritis took the drug for 3 months. Blood tests showed that x = 8.4 with sample standard deviation s = 2.7. Use a...
Let x be a random variable that represents the pH of arterial plasma (i.e., acidity of the blood). For healthy adults, the mean of the x distribution is μ = 7.4.† A new drug for arthritis has been developed. However, it is thought that this drug may change blood pH. A random sample of 36 patients with arthritis took the drug for 3 months. Blood tests showed that x = 8.7 with sample standard deviation s = 3.4. Use a...
9.3 Section Exerc Use Critical Values for the Student's t Distribution Table to find the critical value or values for the following values of the significance level a, sample size n, and alternate hypothesis H. Part: 0/4 Part 1 of 4 When a = 0.10, n = 13, and Huu HO-
13. Use the Student's t-distribution to find the t-value for each of the given scenarios. Round t-values to four decimal places. Find the value of t such that the area in the left tail of the t-distribution is 0.005, if the sample size is 65. t= Find the value of t such that the area in the right tail of the t-distribution is 0.0005, if the sample size is 141. t= Find the value of t such that the area...
Using a table of critical t-values of the t distribution, find the range of values for the P-value for testing a claim about the mean body temperature of healthy adults for a left-tailed test with n = 11 and test statistic t -2.594. Click the icon to view a table of critical t-values. What is the range of values for the P-value? A. 0.025 P-value < 0.05 B. 0.01 P-value < 0.025 O C. 0.005 P-value < 0.01 O D....