1.In a survey, 32%
of the respondents stated that they talk to their pets on the answering machine or telephone. A veterinarian believed this result to be too high, so
hehe
randomly selected
250
pet owners and discovered that
70
of them spoke to their pet on the answering machine or telephone. Does the veterinarian have a right to beskeptical? Use the
alphaαequals=0.05
level of significance.
2.Test the hypothesis using the classical approach and the P-value approach.
Upper H 0 : p equals 0.45 versus Upper H 1 : p less than 0.45H0: p=0.45 versus H1: p<0.45
n equals 150 comma x equals 62 comma alpha equals 0.05
Complete parts (a) through (c) below.
(a) Determine the critical value(s) for a right-tailed test of a population mean at the alphaαequals=0.05level of significance with 20degrees of freedom.
(b) Determine the critical value(s) for a left-tailed test of a population mean at the alphaαequals=0.05level of significance based on a sample size of nequals=15
(c) Determine the critical value(s) for a two-tailed test of a population mean at the alphaαequals=0.01 level of significance based on a sample size of nequals=18
To test Upper H 0H0: muμequals=100 versus Upper H 1H1: muμnot equals≠100, a simple random sample size of nequals=18 is obtained from a population that is known to be normally distributed. Answer parts(a)-(d).
Several years ago, the reported mean age of an inmate on death row was 42.6 years. A sociologist wondered whether the mean age of a death-row inmate has changed since then. HeHe randomly selects 4141 death-row inmates and finds that their mean age is 40.8, with a standard deviation of 10.5. Construct a90% confidence interval about the mean age of death row inmates. What does the interval imply?
Choose the correct hypotheses.
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