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City of Phoenix police believe that the number of calls for service on any summer night is related with temperature (the hotter the night, the more calls to police). If the number of calls can be forecast, the department can use the results to allocate personnel. A research analyst regresses the number of calls for service (Y) on the Fahrenheit temperature at 4:00 in the afternoon (X). The regression equation finds: Y = 62 + 2.4X with an r2 of .67
If the temperature at 4:00 PM on May 30th is 100 degrees, how many calls for service can Phoenix police expect to have that night?
A review of voter registration records in a small town yielded the following table of the number of males and females registered as Democrat, Republican, or some other affiliation.
Create a hypothesis and perform a series of tests to determine if there is any fundamental difference in the findings.
Results were analyzed using one -way ANOVA and included SSTR =7 , 102 and SSE = 10 ,511. Are all 8 tapes equally appealing on average? Determine p value?
By constructing null and alternative hypotheses, computing critical values, and comparing test statistic to critical value.
95% of breaking strengths will be contained between what two values symmetrically distributed around mean?
Part 1. What is the appropriate distribution for such data? Part 2. Is this lot anomalous?
Generate descriptive statistics. Create a stem-and-leaf plot of the data and box plot of the data.
A coin is flipped e times and heads (h) or tails (t) are recorded:
Mean and standard deviation are 584.6 and 34.28
At the .05 significance level, is there a difference in the proportion of viewers watching the three channels?
A busy landscaping supplies company sells wood chips for garden mulch. The mulch is sold by the cubic metre and delivered to households in a small truck.
Determine a 95 % confidence interval for the iron concentration.
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