ch8Bprac SHORT ANSWER. Write the word or …

1 Ch8 BpracSHORT ANSWER. Write the word or phrase that best completes each statement or answers the the null hypothesis, alternative hypothesis, test statistic, P-value, conclusion about the null hypothesis, and finalconclusion that addresses the original )Various temperature measurements are recorded at different times for a particular mean of20 C is obtained for60 temperatures on60 different days. Assuming that = C, test the claim that the population mean is22 C. Use a significance )2)The health of employees is monitored by periodically weighing them in. A sample of 54employees has a mean weight of lb. Assuming that is known to be lb, use significance level to test the claim that the population mean of all such employeesweights is less than 200 )Test the given claim.

2 Use the P-value method or the traditional method as indicated. Identify the null hypothesis,alternative hypothesis, test statistic, critical value(s) or P-value, conclusion about the null hypothesis, and finalconclusion that addresses the original )A simple random sample of 15-year old boys from one cityis obtained and their weights(in pounds) are listed below. Use a significance level to test the claim that these sampleweights come from a population with a mean equal to149 lb. Assume that the standarddeviation of the weights of all 15-year old boys in the city is known to lb. Use thetraditional method of testing 151 134 189 157 144 175 127 1643)4)The mean resting pulse rate for men is 72 beats per minute.

3 A simple random sample ofmen who regularly work out at Mitch's Gymis obtained and their resting pulse rates (inbeats per minute) are listed below. Use a significance level to test the claim that thesesample pulse rates come from a population with a mean less than 72 beats per that the standard deviation of the resting pulse rates of all men who work out atMitch's Gym is known to beats per minute. Use the traditional method of 84 74 64 6970 66 80 59 71 76 634)MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the whether the hypothesis test involves a sampling distribution of means that is a normal distribution, Student tdistribution, or )Claim: =981.

4 Sample data: n=24,x=972, s=26. The sample data appear to come from anormally distributed population with = )A)NeitherB)Student tC)Normal6)Claim: =120. Sample data: n=11,x=100, s= The sample data appear to come from anormally distributed population with unknown and .6)A)Student tB)NeitherC)Normal1 SHORT ANSWER. Write the word or phrase that best completes each statement or answers the that a simple random sample has been selected from a normally distributed population. Find the test statistic,P-value, critical value(s), and state the final )Test the claim that for the population of female college students, the mean weight is givenby = 132 lb.

5 Sample data are summarized asn= 20,x= 137 lb, ands= lb. Use asignificance level of = )8)Test the claim that the mean age of the prison population in one city is less than 26 data are summarized asn= 25,x= years, ands= years. Use a significancelevel of = )Assume that a simple random sample has been selected from a normally distributed population and test the given either the traditional method or P-value method as indicated. Identify the null and alternative hypotheses, teststatistic, critical value(s) or P-value (or range of P-values) as appropriate, and state the final conclusion that addresses theoriginal )A test of sobriety involves measuring the subject's motor skills.

6 Twenty randomly selectedsober subjects take the test and produce a mean score of with a standard deviation At the level of significance, test the claim that the true mean score for all sobersubjects is equal to the traditional method of testing )10)A manufacturer makes ball bearings that are supposed to have a mean weight of 30 g. Aretailer suspects that the mean weight is actually less than 30 g. The mean weight for arandom sample of 16 ball bearings g with a standard deviation g. At the level, test the claim that the sample comes from a population with a meanweight less than 30 g. Use the traditional method of testing )11)A cereal company claims that the mean weight of the cereal in its packets is 14 oz.

7 Theweights (in ounces) of the cereal in a random sample of 8 of its cereal packets are the claim at the significance )Use the traditional method to test the given hypothesis. Assume that the population is normally distributed and that thesample has been randomly )The standard deviation of math test scores at one high school is A teacher claims thatthe standard deviation of the girls' test scores is smaller than A random sample of 22girls results in scores with a standard deviation Use a significance level of totest the teacher's )13)A manufacturer uses a new production method to produce steel rods. A random sample of17 steel rods resulted in lengths with a standard deviation cm.

8 At the level, test the claim that the new production method has lengths with astandard deviation different from cm, which was the standard deviation for the )14)In one town, monthly incomes for men with college degrees are found to have a standarddeviation of $650. Use a significance level to test the claim that for men withoutcollege degrees in that town, incomes have a higher standard deviation. A random sampleof 22 men without college degrees resulted in incomes with a standard deviation of $ )2 Answer KeyTestname: CH8 BPRAC1)H0: =22;H1: J22. Test statistic: z= P-value: Because the P-value is less than the significance levelof = ,we reject the null hypothesis.

9 There is sufficient evidence to warrant rejection of the claim that thepopulation mean temperature is22 )H0: = 200;H1: < 200; Test statistic: z= P-value: Fail to rejectH0. There is not sufficient evidence tosupport the claim that the mean is less than 200 )H0: =149 lbH1: J149 lbTest statistic: z= :z= not rejectH0;At the 1% significance level, there is not sufficient evidence to warrant rejection of the claim thatthesesample weights come from a population with a mean equal to149 )H0: = 72 beats per minuteH1: <72 beats per minuteTest statistic: z= :z= ;At the 5% significance level, there is sufficient evidence to support the claim sample pulse ratescome from a population with a mean less than 72 beats per )C6)A7) = statistic: t= : p= values: t= the test statistic, t< , we fail to reject the null hypothesis.

10 There is not sufficient evidence to warrantrejection of the claim that = 132 ) = statistic: t= : p= value: t= the test statistic, t> , we do not reject the null hypothesis. There is not sufficient evidence to support theclaim that the mean age is less than26 )H0: = : J statistic: t= Critical values: t= , Reject H0. There is sufficientevidence to warrant rejection of the claim that the mean is equal to )H0: = 30 : < 30 g. Test statistic: t= Critical value: t= Fail to rejectH0. There is not sufficientevidence to support the claim that the mean is less than 30 )H0: = 14 : J 14 oz. Test statistic: t= Critical values: t= Fail to rejectH0.