Suppdse a tire cdmpany develdped twd new brands dftires and wduld like td cdmpare the variability dfthe tire
life dfthe twd. Beth brands were driven under ndrmal cdnditidns. and randdm samples dfthe tires were
cellected. The table belew shews the sample s
Security is investigating procedures at an airpert te reduce Terminal J1. Terminal B
the variability in the ameunt eftime it takes passengers te 33mph; Standard _ _
get threugh airpert security. The fellewing table summarizes demagnn 10-2 m'nL'lE’S
sample
Consider the hypothesis statement shown below.
H”: of = :1;
H1: or? #15;
State your conclusion given that s1 =42. s2 = 39.n1=2i". n2 = 31]. and ot=E|.UE.
Clich here to view a table of critical F-scores with [1.05 in the right tail ofthe distribution.
Clic
Suppose that on a WEI-point test. the teacher's goal is for her students' exam scores to have a standard
deviation ofless than T points. A recent sample ofEE exams has a sample standard deviation of 3".6.
a. Test whether or net her goal was achieved using
A ccmpany prcduces hard pretzels and packages them in 1E-cunce bags. Hewever.
the size cfeach pretzel makes it challenging tc ﬁll each bag tc precisely 1E cunces. 153 153 153
When the ﬁlling prccess is wcrking ncrmally. the standard deviaticn cfthe bag 1
Censiderthe hypethesis statement tn the right. HI]; .52 :21_g
State yeur eenelusien given that s = 5.3. n =23. and :1 = [1.10. H1; .52 2213
Clielr the ieen te view a table ef ehi-sguare critical values.
Calculate the apprepriate test statistic.
Use the f
ICensiderthe hypethesis statement te the right. HI]; 32 2110
State veur cenclusien given that s =25. n :22. and u=ﬂ.1U. H1; 02 {113
Click the icen te view a table at chi-square critical values.
Calculate the apprepriate test statistic.
Use the fermula fe
The number oftimes a machine broke down each week was observed over a period of 100 weeks and recorded
as shown in the table below. Complete parts a and b below.
Number of :I
Breakdnwng El 1 2 3 4 5 or More
Number “f s 2? 39 1:" s 2
weeks
3. Using or: [1.
A survey was cenducted twe years age asking cellege students R Old New Survey
theirtep metivatiens fer using a credit card. The percentages are ESPDHSE Survey “if: Frequency, f
shewn in the table te the right. Alse shewn in the table is the 109
ebserved f
ContingencyI table
de
Davs Overdue at
30 days or less TE 29 29
31—50 days 15 E 1U
51 days or more 11 12 I"
Pfl Flt DONE!
Suppose a credit card company would like to determine ifthe type ofcredit card inﬂuences the payment status
ofa customer's acco
{lentingency table
Column Uariable
Row Uariable C1 C2 (33
R1 23 E 15
R2 9 11 8
R3 13 12 T
Print DONE
Considerthe following contingencytable of observed frequencies. Complete parts a. through e. below.
Clickthe icon to view the contingency table.
a. Ide
Observed weekly patient visits - X
53 BE 35 33 132 142 131 El
11? 142 13? 115 33 ?2 95
53 35 E12 1111 123 FIE 1111]
92 114 123 13? 112 1113 113
14? 11]? 133 113 11? ?2
Pn'nt Done
Recall that to construct a conﬁdence interval for the mean when the popula
A retailer receives shipments ef batteries in packages Number ef Defective Frequencyr ef CI
of EU. The retailer randemhr samples 4i1l1 packages Batteries per Package Occurrence
and tests te see ifthe batteries are defective. A [1 158
sample df4UE1 package
Suppese that a randem sample ef 100 men between the ages ef25 and 54 was selected and it was feund that
T8 were currently wdrking. A similar sample cf 100 wdmen was selected and T5 were wdrking. Cdmplete parts
a and b belew.
3. Using er: [1.05. can it be
Use the accompanying partially completed two-way ANOW—‘i summary table to complete parts a through e
below.
Clickthe icon to view the table.
a} Complete the two-way ANOVA table below.
Sum of Degrees of Mean Sum of
Source Squares Freedom Squares F
Facto
Flavor ratings
Person Flavor1 Flavorl Flavor3 Flavoril El
1 1T 18 1E] 15
2 15 15 15 15
3 15 1E 14 1?
4 11 1T 11] 12
5 E 11 5 15
5 11 11] 5| 14
Print DONE
Suppose an energy.r drink manufacturer has developed four new drink ﬂavors and would like to conduc
More Info
Black Sample1 Sample 2 Sample 3 Sampled El
1 T
2
3
.4
5
Considerthe accompanying data collected for a randomized block ANCVA. Complete parts a}through d} below.
Clickthe icon to viewthe data.
Click the icon to view a table of critical F-scor
Censiderthe accempanying data cellected fer a twe-way ANCI‘v'A.
Click the icen te viewthe data table.
a} Using [1 = 0.025. is there signiﬁcant interactien between Facters A and El?r
b} Using [1 = 0.025. are the FacterA means different?
c} Using [1 = 0.02
Considerthe accompanying partially completed randomized block ANOVA summarytable. Complete parts a}
through :1} below.
Click the icon to view the partially completed ANOVAtabIe.
Click here to view Page 1 ofthe table of critical 3-distribution values.
Cli
A consumer group would like to compare the satisfaction ratings ofthree restaurant chains. A. El. and C. A
random of satisfaction scores on a scale of 1-20 was collected from customers at each restaurant. The
accompanying table contains the scores.
3. Per
Ccnsiderthe data inthetable cellectedfrem feur Sample Sample Sample Sample El
independent pepulatiens. 1 2 3 4
3} Calculate the tetal sum cf squares {SST}. 26 1? 2D 22
b} F'artitien the SST inte its twe components. the sum cf 29 19 14 14
squares between
Consider the partially oompleted one-way ANOW—‘t summary table below.
a} Complete the remaining entries in the Sum of Degrees of Mean Sum of
table. Souroe Sguares Freedom Sguares F
b} How many population means are being Between ? 3 ? ?
lESlEEl? Within 216