Qnt 351 final exam new

  

1)An corroborator control American Health Insurance reports that 20% of policyholders resign a right during the year. 15 policyholders are chosen chancely. What is the verisimilitude that at subsidedest 3 of them resignted a right the prior year?    

​ 

.200

​.708

​.250

​.602

2) A exploration strong conducted a review to enumerate the middle total firm smokers disburse on cigarettes during a week.  A scantling of 64 smokers inspired that  = $20 and S = $5.  What is the 95% dependence gap control μ? ​

$18.78 to $21.23

​18.16 to 21.84

​$18.60 to $21.40

​18.37 to 21.63

3) When a adjust gap is developed as 100 up to 200, _________________________. ​

Observations with computes of 200 are interposed in the adjust

​Observations with computes of 200 are embracing from the adjust

​Observations with computes of 100 are embracing from the adjust

​The adjust gap is 99

4) A assembly of women prepared five brands of fingernail furbish and ranked them according to enjoyment. What flatten of mass is this? ​

Ordinal

​Nominal

​Interval

​Ratio

5) A occasion enjoin incurvation equation control Hammer Hardware is Y’ = 5.6 + 1.2t, where sales are in pets of dollars and t extensions by individual part control each year. If the compute of sales in the balance year of 2016 is $5.6 pet, what would be the appreciated sales total control 2018?

$8 pet

​$6.8 pet

​Unable to enumerate from dedicated knowledge

​$5.6 pet

6) A burden-waste corporation wants to statistically substantiate that its methods effort. They chancely chosen 10 clients who had been on the burden waste program control betwixt 55 and 65 days. They looked at their preface burdens and their present burden. The statistical proof they should husband is:​

t proof control discord in paired scantlings

​z proof control span population relations

​z proof control span population middles

​t proof control span population middles

7) A coffee creator is assiduous in whether the middle daily hitherening of regular-coffee drinkers is hither than that of decaffeinated-coffee drinkers.  A chance scantling of 50 regular-coffee drinkers showed a middle of 4.35 cups per day, with a codel flexuosity of 1.2 cups per day.  A scantling of 40 decaffeinated coffee drinkers showed a middle of 5.84 cups per day, with a codel flexuosity of 1.36 cups per day.  What is your computed z-statistic?​

z = -2.45

​z = -5.44

​z = -1.81

​z = – 3.90

8) A fancy concerning the burden of newlightborn infants at a enjoin hospital is that the middle is 6.6 pounds. A scantling of seven infants is chancely chosen and their burdens at extraction are commemorative as 9.0, 7.3, 6.0, 8.8, 6.8, 8.4, and 6.6 pounds. What is the alternate fancy? ​

H1: µ ≠ 6.6

​H1: µ ≥ 6.6

​H1: µ > 7.6

​H1: µ = 6.6

9) As the largeness of the scantling extensions what happens to the extinguishedline of the dispensation of scantling middles? ​

It avenuees a natural dispensation.

​It canreferable be predicted in degree.

​It is categorically skewed.

​It is negatively skewed.

10) You consummate a fancy proof at the .05 flatten of consciousness.  Your computed p-compute turns extinguished to .042.  What is your resolution abextinguished the fancy? 

You would throw-by Ho

​You would recognize Ho

​You would recognize Ho if it is a span-tailed proof, still throw-by Ho if a individual-tailed proof

​You can’t restore a resolution unhither you distinguish the computed proof statistic

11) University officials totalege that at subsidedest 70% of the voting student population supports a fee extension. If the 95% dependence gap estimating the relation of students cherished the fee extension is [0.75, 0.85], what blank can be delineaten? ​

Since this was referable balanced on the population, no blank can be delineaten.

​Seventy percent is referable in the gap, so claim it succeed referable be cherished.

​The gap appreciate is over 70%, so refatigue that it succeed be cherished.

​Seventy percent is referable in the gap, so another scantling is needed.

12) The middle of a natural dispensation is 400 pounds. The codel flexuosity is 10 pounds. What is the verisimilitude of a burden betwixt 415 pounds and the middle of 400 pounds? 

0.3413

​0.5000

​0.4332

​0.1932

13) The MacBurger restaurant security rights that the uncertainty occasion of customers control advantage is naturally nice, with a middle of 3 specifics and a codel flexuosity of 1 specific.  The quality-assurance office established in a scantling of 50 customers at the Warren Road MacBurger that the middle uncertainty occasion was 2.75 specifics.  When you consummate a proof of fancy, what would be the resulting p-value? ​

.0586

​.0384

​.0471

​.0512

14) The stalk personality of fatigues mounted on light-duty trucks follows the natural verisimilitude dispensation with a middle of 60,000 miles and a codel flexuosity of 4,000 miles. Suppose you bought a established of disgusting fatigues, what is the exhibition the middle fatigue personality of these disgusting fatigues is betwixt 57,000 and 63,000 miles? 

1.00

​Very slight

​0.4332

​0.8664

15) In a dispensation, the assist quartile corresponds with the __________.​

Variance

​Mode

​Median

​Mean

16) A assembly of 100 students was reviewed abextinguished their concern in a newlightlight International Studies program. Concern was measured in provisions of noble, middle, or subsided. In the examine, 30 students responded noble concern, 40 students responded middle concern, and 30 students responded subsided concern. What is the not-absolute abundance of students with noble concern? ​

.40

​.30

​.030

​.50

17) The Director of Golf control a national race wants to examine the enumerate of rounds played by members on weekdays. He collected the scantling knowledge shown besubsided control 520 rounds. At the .05 consciousness flatten, is there a discord in the enumerate of rounds played by day of the week?

  

Day

Rounds

 

Monday

124

 

Tuesday

74

 

Wednesday

104

 

Thursday

98

 

Friday

120

No, consequently χ2 = 11.793

​Yes, consequently χ2 = 15.308

​No, consequently χ2 = 7.715

​Yes, consequently χ2 = 12.288

18) Which avenue to verisimilitude claims that the events are homogeneous slight?​

Empirical

​Mutually exclusive

​Classical

​Subjective

19) Sales at a fast-food restaurant middle $6000 per day. The restaurant unwavering to usher-in an advertising belligerence to extension daily sales. To enumerate the virtue of the advertising belligerence, a scantling of 49 days of sales was charmed. It established that the middle daily sales were $6,400 per day. From late narrative, the restaurant knewlight that its population codel flexuosity is abextinguished $1,000. The compute of the proof statistic is _______. ​

1.96

​6,000

​6,400

​2.8

FINAL

20) A examine by the National Park Advantage inspired that 50% of the vacationers going to the Rocky Mountain district mark Yellowstindividual Park, 40% mark the Grand Tetons, and 35% mark twain. What is the verisimilitude that a vacationer succeed mark at subsidedest individual of these stately attractions? 

0.35

​0.55

​0.95

​0.05

21) The ages of total the patients in the insularity repel of the hospital are 38, 26, 13, 41, and 22. What is the population codel flexuosity? ​

6.92

​10.33

​15.85

​9.26

22) The dispensation of a scantling of the extinguishedside diameters of PVC pipes approximates a well-proportioned, bell-shaped dispensation. The arithmetic middle is 14.0 inches, and the codel flexuosity is 0.1 inches. Abextinguished 68% of the extinguishedside diameters repose betwixt what span totals? ​

13.5 and 14.5 inches

​13.9 and 14.1 inches

​13.0 and 15.0 inches

​13.8 and 14.2 inches

23) Each month the National Association of Purchasing Managers publishes the NAPM protest.  Individual of the scrutinys asked on the review to purchasing agents is: Do you imagine that the arrangement is expanding?  Last month, of the 300 responses, 160 answered “yes” to the scrutiny.  This month, 170 of the 290 responses involved that the arrangement is expanding.  If you’re proofing to discover if a larger relation of agents believe that the arrangement is expanding this month, what is your computed proof statistic?

z = -1.29

​t = -1.25

​t = -1.07

​z = -1.11

24) The highest card chosen from a codel 52-card decorate was a tyrant. If it is returned to the decorate, what is the verisimilitude that a tyrant succeed be delineaten on the assist preoption? 

​1/3 or 0.33

​1/13 or 0.077

​1/4 or 0.25

​12/13 or 0.923

25) An codel of a promotive wavering is _________________. ​

Burden of a person

​Miles betwixt gloze changes

​Enumerate of children in a family

​Color of ink in a pen

26) Which of the aftercited is gentleman concerning the natural dispensation? ​

It has span codes.

​The points of the incurvation unite the x-axis at z = -3 and z = 3.

​It is asymmetrical.

​The middle, resourcesn, and code are total resembling.

27 )What is the collocate of computes control a coefficient of interdependence? 

Unlimited collocate

​0 to +1.0

​-1.0 to +1.0 inclusive

​-3 to +3 inclusive

28) Consider the aftercited retrogression segregation betwixt sales (Y in $1000) and collective resources advertising (X in dollars).  = 55,000 + 7X

The retrogression equation implies that an:

​​extension of $1 in advertising is associated with an extension of $7,000 in sales.

​extension of $1 in advertising is associated with an extension of $62,000 in sales.

​extension of $7 in advertising is associated with an extension of $7,000 in sales.

​extension of $1 in advertising is associated with an extension of $7 in sales.

29) When statisticians stir scantling facts in enjoin to delineate blanks abextinguished the characteristics of a population, this is referred to as: ​

Descriptive statistics

​Facts summarization

​Statistical retireence

​Facts segregation

30) What is the resourcesn of 26, 30, 24, 32, 32, 31, 27, and 29? ​

32

​29.5

​30

​29

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