Question 19N.2.SL.TZ0.g
| Date | November 2019 | Marks available | [Maximum mark: 2] | Reference code | 19N.2.SL.TZ0.g |
| Level | SL | Paper | 2 | Time zone | TZ0 |
| Command term | Analyse | Question number | g | Adapted from | N/A |
Analyse the data on the state of infection of tick nymphs with B. burgdorferi in control and vaccinated mice.
[2]
a. at Site 1 there is little/no significant difference in the proportion of infected nymphs/numbers of infected and uninfected nymphs collected from both control and vaccinated mice ✔
b. at Site 2 the proportion of infected nymphs is lower in those collected from vaccinated than control mice
OR
at Site 2 «significantly» more nymphs are not infected from vaccinated than control mice ✔ For mpb and mpd, accept converse answers that give the proportions/percentages of uninfected nymphs rather than infected.
c. at both sites there are fewer infected than uninfected nymphs in those collected from both vaccinated and control mice ✔
d. proportion of infected nymphs is lower at Site 1 than Site 2 in nymphs collected from both control and vaccinated mice
OR
22 % of control mice and 23 % of vaccinated mice with infected nymphs at Site 1 AND 39 % of control mice and 29 % of vaccinated mice with infected nymphs at Site 2 ✔ Percentages are required for the second alternative of mpd.
Accept “ticks” instead of “tick nymphs” or “nymphs”
Do not accept quoting of untransformed numerical data.
